Luftwaffe Fighter-Bombers and Destroyers

The Messerschmitt Bf 110 Zerstörer / Destroyer

National origin:- Germany

Role:- Heavy fighter, Ground-attack aircraft, Fighter-bomber/Night fighter

Manufacturer:- Bayerische Flugzeugwerke Messerschmitt

Designer:- Willy Messerschmitt

First flight:- 12th May 1936

Introduction:- 1937; Retired:- 1945 (Luftwaffe)

Primary users:- Luftwaffe, Hungarian Air Force, Regia Aeronautica, Romanian Air Force

Produced:- between 1936-1945

Number built:- 6,170[N1]

From 1938 onwards, the Luftwaffe had developed the Me-110 twin engined fighter; called the 'heavy' or 'destroyer' fighter (Zerstörer ). The role of this fighter was theoretically to be the pursuit of enemy formations operating over the Reich or returning over their own territory. In point of fact many squadrons of these aircraft were employed in the early war campaign. The twin-engine fighter was something new in German pre-war concepts, and in the Staff College lectures its experimental nature was constantly emphasized.

From The Rise and Fall of the German Air Force 1933-1945 issued by the Air Ministry (A.C.A.S.[1].1948)

The Messerschmitt Bf 110, often known non-officially as the Me 110,^[N2] is a twin-engine heavy fighter (Zerstörer—German for 'Destroyer') and fighter-bomber (Jagdbomber or Jabo) developed in Nazi Germany in the 1930s and used by the Luftwaffe during World War II. Hermann Göring was a proponent of the Bf 110. It was armed with two MG FF 20 mm cannon, four 7.92 mm (.312 in) MG 17 machine guns, and one 7.92 mm (.312 in) MG 15 machine gun or twin-barrel MG 81Z for defence. Development work on an improved type to replace the Bf 110, the Messerschmitt Me 210 began before the war started, but its teething troubles from its aerodynamics resulted in the Bf 110 soldiering on until the end of the war in various roles, alongside its replacements, the Me 210 and the significantly improved Me 410 Hornisse.

The Bf 110 served with considerable initial success in the early campaigns in Poland, Norway and France. The primary weakness of the Bf 110 was its lack of agility in the air, although this could be mitigated with the correct tactics. This weakness was exploited when flying as close escort to German bombers during the Battle of Britain. When British bombers began targeting German territory with nightly raids, some Bf 110-equipped units were withdrawn and redeployed as night fighters, a role to which the aircraft was well suited. After the Battle of Britain the Bf 110 enjoyed a successful period as an air superiority fighter and strike aircraft in other theatres, and defended Germany from strategic air attack by day against the USAAF's 8th Air Force, until a major change in American fighter tactics rendered them increasingly vulnerable to developing American air supremacy over the Reich as 1944 began.

During the Balkans Campaign, North African Campaign and on the Eastern Front, it rendered valuable ground support to the German Army as a potent fighter-bomber. Later in the war, it was developed into a formidable radar-equipped night fighter, becoming the major night-fighting aircraft of the Luftwaffe. Most of the German night fighter aces flew the Bf 110 at some point during their combat careers, and the top night fighter ace of all time, Major Heinz-Wolfgang Schnaufer, flew it exclusively and claimed 121 victories in 164 combat missions.^[N3]

Genesis and competition

Throughout the 1930s, the air forces of the major military powers were engaged in a transition from biplane to monoplane designs. Most concentrated on the single-engine fighter aircraft, but the problem of range arose. The Reichsluftfahrtministerium (RLM), pushed by Hermann Göring, issued a request for a new multipurpose fighter called the Kampfzerstörer (battle destroyer) with long range and an internal bomb bay. The request called for a twin-engine, three-seat, all-metal monoplane that was armed with cannon as well as a bomb bay. Of the original seven companies, only Bayerische Flugzeugwerke (Messerschmitt), Focke-Wulf and Henschel responded to the request.^[N4]

Messerschmitt defeated Focke-Wulf, Henschel and Arado, and was given the funds to build several prototype aircraft. The Focke-Wulf design, the Focke-Wulf Fw 57, had a wing span of 25.6 m (84 ft) and was powered by two DB 600 engines. It was armed with two 20 mm MG FF cannons in the nose and a third was positioned in a dorsal turret. The Fw 57 V1 flew in 1936 but its performance was poor and the machine crashed.^[N5] The Henschel Hs 124 was similar in construction layout to the Fw 57,^[N5] equipped with two Jumo 210C for the V1. The V2 used the BMW 132Dc radial engines generating 870 PS compared with the 640 PS Jumo. The armament consisted of a single rearward-firing 7.92 mm (.312 in) MG 15 machine gun and a single forward-firing 20 mm MG FF cannon.^[N5]

Messerschmitt omitted the internal bomb load requirement from the RLM directive to increase the armament element of the RLM specification. The Bf 110 was far superior to its rivals in providing the speed, range and firepower to meet its role requirements.^[N6] By the end of 1935, the Bf 110 had evolved into an all-metal, low-wing cantilever monoplane of semi-monocoque design featuring twin vertical stabilizers and powered by two DB 600A engines. The design was also fitted with Handley-Page wing slots^[N6](actually, leading-edge slats).

Early variants

By luck (and pressure by Ernst Udet), RLM reconsidered the ideas of the Kampfzerstörer and began focusing on the Zerstörer. Due to these changes, the Bayerische Flugzeugwerke design better fitted RLM's requests. On 12 May 1936, Rudolf Opitz flew the first Bf 110 out of Augsburg.^[N7] But, as many pre-war designs found, the engine technologies promised were not up to acceptable reliability standards. Even with the temperamental DB 600 engines, the RLM found the Bf 110, while not as maneuverable as desired, was quite a bit faster than its original request specified, as well as faster than the then-current front line fighter, the Bf 109 B-1. Thus the order for four pre-production A-0 units was placed. The first of these were delivered on January 1937. During this testing, both the Focke-Wulf Fw 187 and Henschel Hs 124 competitors were rejected and the Bf 110 was ordered into full production.

The initial deliveries of the Bf 110 encountered several delays with delivery of the DB 600 motors, which forced Bayerische Flugzeugwerke to install Junkers Jumo 210B engines, leaving the Bf 110 seriously underpowered and able to reach a top speed of only 431 km/h (268 mph). The armament of the A-0 units was also limited to four nose-mounted 7.92 mm (.312 in) MG 17 machine guns.

Even without delivery of the DB 600 engines, Bayerische Flugzeugwerke began assembly of the Bf 110 in mid-1937. As the DB 600 engines continued to have problems, Bayerische Flugzeugwerke was forced to keep on using Jumo motors, the 210G, which supplied 515 kW (700 PS) each (versus the 471 kW/640 PS supplied by the 210B). Three distinct versions of the Bf 110B were built, the B-1, which featured four 7.92 mm (.312 in) MG 17 machine guns and two 20 mm MG FF cannons. The B-2 reconnaissance version, which had a camera in place of the cannons, and the B-3 which was used as a trainer, with the cannons replaced by extra radio equipment. Only 45 Bf 110Bs were built before the Jumo 210G engine production line ended. The major identifier of the -A and -B-series Bf 110s was the very large 'mouth' bath radiators located under each engine.

In late 1938, the DB 601 B-1 engines became available. With the new engine, the design teams removed the radiators under the engine nacelles and replaced them with water/glycol radiators for the C-series airframes onwards, placing them under the wing just outboard of each nacelle, otherwise similar in installation, appearance and function to those on the Bf 109E. With the DB 601 engine, the Bf 110's maximum speed increased to 541 km/h (336 mph) with a range of approximately 1,094 km (680 mi). A small oil cooler and airscoop remained under each engine nacelle for the remainder of the Bf 110's production run.

First conceived in the latter half of 1939, the D-series of Bf 110s was targeted to have improvements meant to increase its range. The initial D-series version, the Bf 110D-0 was designed to add a large, streamlined 1,050 litre (277 U.S. gallon) ventral fuel tank built under the fuselage, which required a substantially sized, conformal streamlined ventral fuselage fairing extending from halfway back under the nose to the rear of the cockpit glazing, inspiring the nickname Dackelbauch (dachshund's belly).^[N8] The D-1 was also set up to accept a pair of fin-equipped 900 litre (238 U.S. gallon) drop tanks, one under each wing, increasing the total fuel capacity to 4,120 litres (1,088 U.S. gallons). The substantial added drag of the early 'dachshund's belly' ventral fuselage tank in test flights mandated its omission from production D-1s although they were still prepared to mount an improved, better streamlined, version. D-1s so equipped were known as D-1/R1 whereas the D-1/R2 was equipped with two 900 l drop tanks and a droppable 85 l oil tank. Later D-2 and D-3 versions retained the twin underwing 900 litre drop tank capability, using multipurpose ordnance racks capable of holding either drop tanks or carrying bombs.^[N9]

Later production variants

The production of the Bf 110 was put on a low priority in 1941 in expectation of its replacement by the Me 210. During this time, two versions of the Bf 110 were developed, the E and F models. The E was designed as a fighter bomber (Zerstörer Jabo), able to carry four 50 kg (110 lb) ETC 50 racks under the wing, along with the centreline ETC 500 bomb rack. The first E, the Bf 110 E-1 was originally powered by the DB 601B engine, but shifted to the DB 601P as they became available in quantity. A total of 856 Bf 110E models were built between August 1940 and January 1942.^[N10] The E models also had upgraded armour and some fuselage upgrades to support the added weight. Most pilots of the Bf 110E considered the aircraft slow and unresponsive, one former Bf 110 pilot commenting the E was 'rigged and a total dog.'

The Bf 110F featured the new DB 601F engines which produced 993 kW/1,350 PS (almost double the power the original Jumo engines provided), which allowed for upgraded armour, strengthening, and increased weight with no loss in performance. Three common versions of the F model existed. Pilots typically felt the Bf 110F to be the best of the 110 line, being fully aerobatic and in some respects smoother to fly than the Bf 109, though not as fast. Eventually 512 Bf 110F models were completed between December 1941 and December 1942, when production gave way to the Bf 110G.^[N10]

Although the Me 210 entered service in mid-1941, it was plagued with problems and was withdrawn from service for further development. In the wake of the failure of the Me 210, the Bf 110G was designed.^[N11] The G model was fitted with DB 605B engines, producing 1,085 kW (1,475 PS) in 'War Emergency' setting, and 997 kW (1,355 PS) at 5.8 km (19,000 ft) altitude. The Bf 110G also had upgraded nose armament, and underwent some changes which improved the aerodynamics of the aircraft. The rear cockpit access was moved forward from the transversely-hinged, 'tilt-open' rearmost canopy glazing to a side/top hinged opening section of the main canopy, opening to port, with a new rearmost framed glazing section fixed in place. No Bf 110 G-1 existed, so the Bf 110 G-2 became the baseline Bf 110G. A large number of Rüstsätze field conversion packs were available, making the G subtype the most versatile production version of the Bf 110. The initial batch of six pre-series production G-0 aircraft built in June 1942 were followed by 797 G-2, 172 G-3 and 2,293 G-4 models, built between December 1942 and April 1945.^[N10] Pilots reported the Bf 110G to be a 'mixed bag' in the air, in part due to all changes between the G and F series. The Bf 110G was considered a superior gun platform with excellent all-around visibility, and considered, until the advent of the Heinkel He 219, to be one of the Luftwaffe's best night fighters.

Armament

The Bf 110's main strength was its ability to accept unusually powerful air-to-air weaponry. Early versions had four 7.92 mm (.312 in) MG 17 machine guns in the upper nose and two 20 mm MG FF/M cannons fitted in the lower part of the nose. Later versions replaced the MG FF/M with the more powerful 20 mm MG 151/20 cannons and many G-series aircraft, especially those which served in the bomber-destroyer role, had two 30 mm (1.18 in) MK 108 cannons fitted instead of the MG 17. The defensive armament initially consisted of a single, flexibly mounted 7.92 mm (.312 in) MG 15 machine gun. Late F-series and prototype G-series were upgraded to a 7.92 mm (.312 in) MG 81 machine gun with a higher rate of fire, and the G-series was equipped with the twin-barreled MG 81Z. Many G-series night fighters were retrofitted or factory-built with the Schräge Musik off-bore gun system, which fired upward at an oblique angle for shooting down bombers while passing underneath; it was frequently equipped with two 20 mm MG FF/M, but field installations of the 20 mm MG 151/20 or 30 mm (1.18 in) MK 108 cannons were also used. The Schräge Musik weapons were typically mounted immediately in front of the rear cockpit.

The Bf 110 G-2/R1 was also capable of accepting armament such as the Bordkanone series 37 mm (1.46 in) BK 3,7 autofed cannon, mounted in a conformal ventral gun pod under the fuselage. A single hit from this weapon was usually enough to destroy any Allied bomber.

The initial Bf 110 C-1/B fighter-bomber could carry two 250 kg (551 lb), two 500 kg (1,102 lb), or two 1,000 kg (2,204 lb) bombs on two ETC 500 racks under the fuselage and, starting with the Bf 110 E-0, could be supplemented by four additional 50 kg (110 lb) bombs on ETC 50 racks under the wing.

Operational service

Invasion of Poland

Polish Campaign

Hermann Göring reportedly ordered the Zerstörerwaffe to make all the Luftwaffe's Bf 110s available for operations. Future ace, commander of Nachtjagdgeschwader 1 and Jagdfliegerfuhrer Rumänien Wolfgang Falck scored his first kills over Poland, as did future night fighter ace Helmut Lent. Gordon Gollob, future General der Jagdflieger. Falck's unit, I./ZG 76, claimed 31 kills during the campaign, of which 19 were confirmed.^[1] I(Z)./LG 1 also contributed. Escorting German bomber formations on attacks against Warsaw, the unit claimed 30 kills on the first day. Polish fighter units reported a 17% loss rate on this day. This rose to 72% in five days. JGr 2 also claimed 28 aerial and 50 ground victories.^[2]

The Phoney War and the 'Battle of German Bight'

Most of the units protecting western Germany from aerial attack were equipped with the Messerschmitt Bf 109. One of the Bf 110 units assigned to air defence in this sector was Lehrgeschwader 1. On 23 November 1939, the Bf 110 claimed its first Allied victim when LG 1 Bf 110s engaged and shot down a Morane-Saulnier M.S.406 of the Armée de l'Air over Verdun.^[3] Just three weeks later, on 18 December 1939, the Bf 110 participated in the first German victory over British arms in World War II.^[4] RAF Bomber Command sent 22 Vickers Wellington bombers to attack the German naval base at Wilhelmshaven. Despite help from Bf 109 units, it was the Bf 110 which excelled in the bomber destroyer role. By the end of the fighting, the Germans had claimed 38 RAF bombers.^[5] Actual losses were 11 Wellingtons and six damaged to varying degrees.^[6] Some sources claim a 12th Wellington was destroyed.^[7] The raid convinced RAF Bomber Command to consider abandoning the daylight bombing of Germany in favour of night actions.

Invasions of Denmark and Norway

The Bf 110 Zerstörerwaffe (Destroyer Force) saw considerable action during operation Operation Weserübung, the invasion of Denmark and Norway. Two Zerstörergeschwader, (1 and 76), were committed, with 64 aircraft.^[6] The Bf 110s destroyed 25 Danish military aircraft stationed on the Værløse airbase on 9 April through ground strafing. One Danish Fokker C.V did manage to get airborne but was immediately shot down.^[8] During this campaign, Victor Mölders, brother of the famous Werner Mölders, took the official surrender of the town of Aalborg after landing at the local airfield. Dressed in flying gear, he was given a lift into the town centre by a milkman to find suitable quarters for I./Zerstörergeschwader 1's (ZG 1) Bf 110 crews.^[8]

In Norway, the Bf 110s helped secure the Oslo-Fornebu airport, escorting Junkers Ju 52 transports loaded with paratroops (Fallschirmjäger). The Germans were engaged by several Gloster Gladiators and machine guns manned by troops on the ground; in the ensuing battle, both sides lost two aircraft.^[9] The Messerschmitt pilots did not know that many earlier waves of transports had turned back and that the airport was unsecured. Landing their cargoes, many transports were destroyed. The remaining Bf 110s strafed the airfield and helped the ground troops take it; the air support provided by the Zerstörer was instrumental, and it was to perform well as a fighter-bomber in the coming campaigns. During these battles, a future 110-kill Luftwaffe ace, Helmut Lent, scored his fifth and sixth victories against Norwegian opposition.

Helmut Lent's Bf 110C. Lent ran out of fuel and force landed at Oslo Fornebu airfield on 9 April 1940.^[10]

With experience fighting in Norway, efforts were made to extend the combat range of the Bf 110C; these became the Bf 110D Long Range (Langstrecken) Zerstörer. Several different external fuel tanks, originally a 1,200 L (320 US gal) centerline ventral fuel tank (nicknamed Dackelbauch (dachshund's belly), later 300 L or 900 L (240 US gal) underwing-mounted tanks, resulted in no less than four versions of the Bf 110D. The enormous Dackelbauch ventral tank, owing to cold weather and limited knowledge of fuel vapours, sometimes exploded, leading to unexplained losses during the North Sea patrols. As a result, the aircrews came to dislike this version. The handling characteristics were also affected; the Bf 110 was not manoeuvrable to begin with and the added weight made it worse.^[11]

The Zerstörerwaffe performed well when it encountered mostly British bombers. On 13 June 1940, a squadron of Skua dive bombers was intercepted trying to reach and bomb the German battleship Scharnhorst. The 110s shot down eight in as many minutes; among the victors was Herbert Schob, who survived the war as one of the most successful Bf 110 pilots. Total losses during this campaign amounted to little more than 20.^[12] During July, the RAF made several raids on Norway. On 9 July 1940, seven out of a force of 12 Bristol Blenheims bombing Stavanger were shot down by a mixed force of Bf 110s and Bf 109s from ZG 76 and JG 77 respectively.^[13]

Holding the West

Western Campaign, 1940

In the spring of 1940, Walter Horten, Jagdgeschwader 26 technical officer, was invited to participate in a 'mock combat' with a Bf 109E. The Bf 109 bested the Bf 110 time and again. Afterward, Horten said, Gentlemen, be very careful if you should ever come up against the English. Their fighters are all single-engined. And once they get to know the Bf 110s weaknesses, you could be in for a very nasty surprise.^[14]

During the Phoney War, a number of French aircraft were shot down by Bf 110s. ZG 1 Gruppenkommander Hauptmann Hannes Gentzen became the highest-scoring fighter pilot in the Luftwaffe on 2 April, when he shot down a Curtiss Hawk over Argonne.^[14] For the attack on the Netherlands, 145 Bf 110s were committed under Oberst Kurt-Bertram von Döring's Jagdfliegerfuhrer 2.^[15] During the campaign, the Bf 110 demonstrated its capabilities as a strike aircraft. On 10 May, ZG 1 claimed 26 Dutch aircraft destroyed on the ground on Haamstede airfield. Between 11-13 May, most of the 82 aerial claims over Belgium were made by the Bf 110 equipped ZG 26.^[16] However, this was tempered by the loss of nine Bf 110s against the RAF on 15 May.^[17] By this date, Oberstleutnant Friedrich Vollbracht's ZG 2 had claimed 66 Allied aircraft.^[18]

The Bf 110 force also encountered the Swiss Air Force during this period, as several German raids violated Swiss airspace. About five Bf 110s were shot down by Swiss Bf 109s.^[19][20] The Bf 110s participation in Fall Rot's Operationa Paula, an offensive to destroy the remaining French air forces in central France, was to lead to 101 losses for the Luftwaffe, of which just four were Bf 110s. No further losses of the type occurred for the remainder of the campaign.^[21]

The campaign in the west that followed in 1940 demonstrated that the Bf 110 was vulnerable in hostile skies. It performed well against the Belgian, Dutch and French Air Forces, suffering relatively light losses, but was quickly outclassed by increasing numbers of Hurricanes and Spitfires, especially when forced into a tactical role it was never intended for - close range bomber escort - where it was unable to take advantage of its superior altitude performance and speed, and was forced to wait for the enemy to attack rather than roaming about finding and destroying enemy aircraft, as the original Zerstorer concept had intended^[22]. In the Western Campaign, 60 were lost.^[19] This represented 32 percent of the Zerstörerwaffe's initial strength.^[23]

Battle of Britain

The Battle of Britain revealed the Bf 110's fatal weaknesses as a daylight fighter against single-engine aircraft. A relatively large aircraft, it lacked the agility of the Hurricane and Spitfire and was easily seen. The World War I-era Bristol Fighter had done well with a rear gunner firing a rifle-caliber machine gun, but by World War II, this was insufficient to deter the eight-gun fighters facing the Bf 110. Its size and weight meant that it had high wing loading, which limited its maneuverability. Furthermore, although it had a higher top speed than contemporary RAF Hurricanes, it had poor acceleration. However, it was better suited as a long-range bomber escort than most other aircraft of the time, and did not have the problems of restricted range that hampered the Bf 109E. Although outclassed, it was still formidable as a high escort for bombers using the tactic of diving upon an enemy, delivering a long-range burst from its powerful forward-facing armament, then breaking contact to run for it.^[24] However, it was not designed for this purpose, and being used as a close escort tied the fighters to the bombers, taking away their tactical edge, forcing them to always respond to the attacking fighters, which were never taken by surprise, and could easily avoid the attacks of the Zerstorer, and even turn the tables. This limitation of tactical flexibility greatly hampered the ability of the Bf 110 to counter enemy single-engine fighters on a level of parity.^[22]

Hermann Göring's nephew, Hans-Joachim Göring, was a pilot with III./Zerstörergeschwader 76, flying the Messerschmitt Bf 110. He was killed in action on 11 July 1940, when his Bf 110 was shot down by Hurricanes of No. 87 Squadron RAF. His aircraft crashed into Portland Harbour.^[25]

The worst day of the battle for the Bf 110 was 15 August 1940, when nearly 30 Bf 110s were shot down, the equivalent of an entire Gruppe. Between 16-17 August, 23 more were lost.^[26]

After the 18 August there was a marked reduction in the number of Zerstörer operations. Their seeming absence has often been equated with the simultaneous disappearance from the Battle of the Ju 87. But wereas the Ju 87 had to be withdrawn because it simply could not survive in the hostile environment over southern England in the late summer of 1940, the reason for the decrease in Bf 110 activity was much more mundane. Replacements were not keeping pace with losses. There were just not enough Zerstörer available.

— Messerschmitt Bf 110 Zerstörer Aces, World War Two^[27]

The last day of August proved to be a rare success for the Messerschmitt Bf 110. ZG 26 claimed 13 RAF fighters shot down, which 'was not far off the mark', for three losses and five damaged. However, on 4 and 27 September, 15 Bf 110s were lost on each day.^[28] The Luftwaffe had embarked on the battle with 237 serviceable Bf 110s. 223 were lost in the course of it.^[29]

On 10 May 1941, in a strange episode in the aftermath of the Battle of Britain, Rudolf Hess, the deputy leader of the Nazi party, flew in a Bf 110 from Augsburg, north of Munich, to Scotland, apparently in an attempt to broker a peace deal between Germany and Great Britain.

Balkans Campaign

The Messerschmitt Bf 110C and Es were committed to the invasions of Yugoslavia and Greece in April 1941. I and II./ZG 26 were deployed to the theatre. Once again, the Bf 110 encountered foreign flown Messerschmitt Bf 109s, this time belonging to the Yugoslav Air Force. As over Switzerland in 1940, the battles ended in their opponent's favor. On the first day, 6 April, Bf 110s of I./ZG 26 lost five of their number in exchange for two Yugoslav Bf 109s. II./ZG dispatched several Hawker Furys, but managed to lose two of their own against the biplanes.^[30] Over Greece, on 20 April, II./ZG 26 claimed five Hurricanes of No. 33 and No. 80 Squadron RAF for two losses. This engagement saw the death of 50-victory ace Marmaduke Pattle of No 33 Squadron. Staffelkapitän Hauptmann Theodor Rossiwall and Oberleutnant Sophus Baagoe were amongst the claimers on this day, taking their scores to 12 and 14. Also killed in this battle was the ace F/Lt W.J. 'Timber' Woods of No. 80 Squadron with 6½ kills. Oberleutnant Baagoe was killed on 14 May 1941 while on a strafing mission during the Battle of Crete. The British defences and a Gloster Gladiator pilot claimed credit. Around 12 Bf 110s were lost over Crete.^[31]

Invasion of Yugoslavia

North Africa, the Mediterranean and Middle East

The Rashid Ali Rebellion and resulting Anglo-Iraqi War saw the Luftwaffe commit 12 of 4./ZG 76's Bf 110s to the Iraqi Nationalist cause as part of 'Flyer Command Iraq' (Fliegerfuhrer Irak). The German machines reached Iraq in the first week of May 1941. The campaign in the desert would last for ten days. Two RAF Gladiators were claimed by future night fighter ace Martin Drewes, but RAF raids badly damaged two Bf 110s. However, by the 26 May, no Bf 110s were left serviceable and German personnel were evacuated.^[32] One Bf 110 (Wk-Nr 4035) was captured by the RAF and test flown as RAF serial HK846, 'Belle of Berlin'. Based in Cairo, Egypt, it was to be deployed to South Africa as part of a program to train pilots on enemy equipment, but it did not make it, crashing in the Sudan.^[33] In the North African Campaign, the Bf 110 acted as a support aircraft for the Junkers Ju 87 Stuka units. In 1941, nearly 20% of the Zerstörergeschwader's missions were ground-attack orientated. A number of Bf 110 aces were lost in aerial combat during this period, and other losses were considerable.^[30] Significantly, on the night of 22-23 May, the Bf 110 was pressed into night fighting service over the desert. Oberleutnant Alfred Wehmeyer scored three nocturnal kills against Allied bombers in the space of a week. In August 1942, a stalemate between the Allied and Axis forces in North Africa permitted the withdrawal of III./ZG 26 to Crete for convoy protection. During this time, a number of United States Army Air Forces B-24 Liberators were destroyed.^[34] On 29 September 1942, while on patrol alone, Oberleutnant Helmut Haugk of ZG 26 engaged a formation of 11 B-24s, dispatching two of the bombers. The Bf 110 had demonstrated its capability in a role it was to excel in over Europe.^[35] Lastly, in February 1945, two Bf 110G-4s were supplied to the Air Force of the Independent State of Croatia (ZNDH). One was destroyed by Allied bombing at Zagreb; the other survived and sought sanctuary at Klagenfurt in Austria with other retreating ZNDH aircraft in May 1945.^[36][37]

Operation Barbarossa Russian Offensive War in Russia - Bay of Pillau

Eastern Front

Just 51 air worthy Bf 110s took part in the initial rounds of Operation Barbarossa, and all were from three units; ZG 26, Schnellkampfgeschwader 210 (redesignated from Erprobungsgruppe 210) and ZG 76. The Bf 110 rendered valuable support to the German Army by carrying out strike missions in the face of very heavy anti-aircraft artillery defences. A huge number of ground kills were achieved by Bf 110 pilots in the east. Some of the most successful were Leutnant Eduard Meyer, who received the Knight's Cross of the Iron Cross on 20 December 1941 for 18 aerial victories and 48 aircraft destroyed on the ground, as well as two tank kills. Oberleutnant Johannes Kiel was credited with 62 aircraft destroyed on the ground, plus nine tanks and 20 artillery pieces. He was later credited with a submarine sunk and three motor torpedo boats sunk.^[38]

The number of Bf 110s on the Eastern Front declined further during and after 1942. Most units that operated the 110 did so for reconnaissance. Most machines were withdrawn to Nazi Germany for the Defense of the Reich operations.

Defence of the Reich

Eventually withdrawn from daylight fighting, the Bf 110 enjoyed later success as a night fighter, where its range and firepower stood it in good stead for the remainder of the war. The airframe allowed for a dedicated radar operator, and the open nose had space for radar antennae, unlike the single-engine fighters. As the war wore on, the increased weight of armament and radar detection equipment (along with a third crew member) took an increasing toll of the aircraft's performance.

It was also used as a ground attack aircraft, starting with the C-4/B model, and as a day bomber interceptor, where its heavy firepower was particularly useful. Later on, there were dedicated ground attack versions which proved reasonably successful. The Bf 110 served the Luftwaffe extensively in various roles, though no longer in its intended role as a heavy fighter. Another role the Bf 110 took on was as a potent bomber-destroyer. The extreme power of the Bf 110's weaponry (when fitted with 20mm and 30mm cannon) could cripple or destroy any Allied bomber in seconds. Without encountering an Allied escort, it was capable of wreaking immense destruction. When encumbered with a total of four 21 cm (8 in) Werfer-Granate 21 (Wfr.Gr. 21) rocket tubes, with two of these under each outer wing panel, and additional armament, the 110 was vulnerable to Allied escort fighters, partly from the development of a major change in American fighter tactics at the end of 1943, rendering them increasingly vulnerable to developing American air supremacy over the Reich. In late 1943 and early 1944 Bf 110 formations were frequently devastated by the roving Allied fighters.

It was in the role as a night fighter, often armed with the surprisingly effective Schräge Musik upward-firing twin autocannon offensive armament installation, that the Bf 110 and its pilots achieved their greatest successes. Luftwaffe night fighter ace Heinz-Wolfgang Schnaufer was the highest scorer in the Defence of the Reich campaign and ended the war with 121 aerial victories, virtually all of them achieved while flying examples of the Bf 110.^[39] Others, such as Helmut Lent, switched to the night fighter arm and built on their modest daylight scores. Other aircraft, such as the Junkers Ju 88 and the Dornier Do 217, also played a big role, but none more so than the Bf 110.^[40]

Daylight operations

The first victory for the Bf 110 in this capacity was recorded on 4 February 1943 against a B-24 formation attacking Hamm. The Germans suffered from defensive fire as the Bf 110s were a bigger target. Along with the seven Fw 190s and five lost by JG 1, all eight IV./NJG 1s Bf 110s were damaged. They claimed three B-17s, although only one was lost. The reason for the failure was the lack of training in day fighter tactics. Hans-Joachim Jabs said;

This was my only day victory in a night fighter. We flew these missions at no greater than Schwarm strength, and were ourselves never escorted. It was wasteful to use highly trained night fighter crews in this role, and it was given up when the US escorts appeared.^[41]

On 4 March, the unit was back in action, this time destroying three B-17s for two Bf 110s.^[42] During 1943, USAAF bombers were afforded limited protection by American fighters, which did not yet have sufficient range to escort the bombers all the way to and from the target. This gave the Zerstörer force a window of opportunity to wreak damage on the bomber streams. However, the Bf 110s were called away to the Eastern and North African fronts 'rapidly' and 'often' to perform strike, reconnaissance and even dive-bombing missions, leading to inevitable losses. When these units returned to the Reich, they were depleted and required reforming, retraining and re-equipping. The wastage and woeful deployment of the type prevented any lasting success.^[43] Finally, in autumn 1943, the Zerstörergruppen were recalled from their Eastern or Mediterranean bases, and formed into RLV units. Along with the Me 410, it formed the newly rebuilt ZG 26, equipped with three gruppen (two Bf 110 and one Me 410), based near Hannover. I. and III./ZG 76 were based in Austria, and II./ZG 76 was based in France.^[44] On 4 October 1943, the Bf 110 Geschwader intercepted B-17s of the 3rd Bomb Division. The targets around Frankfurt and the Saar region were hit. The Bf 110s flew alone against this formation and destroyed four B-17s, before having the misfortune of running into 56th Fighter Group P-47 Thunderbolts. The Bf 110s lost nine machines, with 11 killed and seven wounded. It is not clear if they managed to shoot down any of their attackers.^[45]

The Bf 110 also supported the German defence during Big Week in February 1944, as Lt. Gen. Doolittle's tactical changes for the 8th Air Force's escort fighters (increasingly consisting of P-51 Mustangs) went into effect: The experiences of Zerstörergeschwader 'Horst Wessel', a Bf 110 squadron, indicates what happened to twin-engine fighters in the new combat environment. The unit worked up over January and February to operational ready status. At 12:13 pm on February 20, 13 Bf 110s scrambled after approaching formations. Six minutes later three more took off to join the first group. When they arrived at the designated contact point there was nothing left to meet. American fighters had jumped the 13 Bf 110s from the sun and shot down 11. Meanwhile two enemy fighters strafed the airfield and damaged nine more aircraft.^[46]

On 22 February, six Bf 110s were lost for two kills against B-17s, while on 6 March, five Bf 110s were lost and one damaged out of nine machines committed.^[46] By April 1944, the Oberkommando der Luftwaffe had hoped to convert the Bf 110 Geschwader to the Me 410. However, after the Me 410 suffered equally high casualty rates, the conversion was delayed. The Bf 110 was considered to be obsolete and phased out of production accordingly. However, while crews found the Me 410 faster in 'raw speed', they found it even less agile than the Bf 110 and very difficult to bail out of. The only other replacement type was the Dornier Do 335, which existed in the form of only a few airworthy prototypes at the time, still undergoing test flight programs.^[47] On 2 April 1944, the Bf 110 achieved one of its final successful engagements. A force of 62 attacked a mixed bomber stream of B-17 and B-24s with R4M rockets, destroying five B-17s and three B-24s, as well as a single P-38 Lightning. Losses were eight Bf 110s.^[48] On 9 April, ZG 76 committed 77 to an USAAF raid on Berlin. USAAF P-51 Mustangs had now appeared, and were able to escort the Allied bombers to and from the target. The Bf 110 force lost 23 of the 77 machines. It never flew another mission in this capacity. The losses had 'marked the beginning of the end of the Bf 110 Zerstörer as a first-line weapon in the RLV'.^[49] The Zerstörer was only to fly as a day fighter against unescorted formations. This would be rare throughout the remainder of the war.^[49]

Night fighter operations

The Bf 110 would be the backbone of the Nachtjagdgeschwader throughout the war. The first units undertook defence operations over Germany as early as the autumn of 1940. Opposition was light until 1942, when British heavy bombers started to appear.

One of the most notable actions of the Bf 110 occurred on the night of the 17/18 August 1943. Some Bf 110 units had been equipped with the experimental Schräge Musik system, an emplacement of two upward-firing cannon, which for its initial installations placed the twin-cannon fitment almost midway down the cockpit canopy behind the pilot, which could attack the blind spot of RAF Bomber Command's Lancaster and Halifax bombers, which lacked a ventral turret. Using this, NJG 5's Leutnant Peter Erhardt destroyed four bombers in 30 minutes.^[50] Despite excellent visibility, none of the RAF bombers had reported anything unusual that would indicate a new weapon or tactics in the German night fighter force. This ignorance was compounded by the tracerless ammunition used by the Bf 110s, as well as firing on the British bombers blind spots. Many RAF crews witnessed a sudden explosion of a friendly aircraft, but assumed, in some cases, it was very accurate flak. Few of the German fighters were seen, let alone fired on.^[51] Later on, as the specialist Bf 110G-4s were received by night fighter wings, the mid-cockpit mount was replaced by one at the extreme rear of the cabin.

In September 1943, Arthur Harris, convinced that a strategic bombing campaign against Germany's cities would force a German collapse, pressed for further mass attacks. While RAF Bomber Command destroyed Hannover's city centre and 86% of crews dropped their bombs within 5 km (3 mi) of the aiming point, losses were severe. The Ruhr Area was the prime target for British bombers in 1943, and German defences inflicted a considerable loss rate. The Bf 110 had a hand in the destruction of some 2,751 RAF bombers in 1943, along with German flak and other night fighters.^[52] Later, the RAF developed a radar countermeasure; Window, to blind German radar and introduced de Havilland Mosquitos to fly feints and divert the Bf 110s and other night fighter forces from their true target, which worked, initially. At this time, the Bf 110 remained the backbone of the fight-force, although it was now being reinforced by the Junkers Ju 88.^[53] In October 1943, General Josef Kammhuber reported the climbing attrition rate as 'unacceptable', and urged Hermann Göring to stop committing the German night fighters to daylight operations. Many Nachtjagdgeschwader had taken part in costly daylight battles of attrition. From June-August, it had increased from around 2% to 9.8%. However the fortunes for the mostly Bf 110 equipped force turned during late August/September 1943. The night fighter arm claimed the destruction of 123 out of some 1,179 bombers over Hamburg on one night; a 7.2% loss rate.^[54] During the Battle of Berlin, 1,128 bombers were lost in five months. RAF Bomber Command had 'nearly burned out'.^[55] These losses were primarily a result of fighter defences, at the heart of which was the Bf 110. The German defences had won a victory which prevented deep penetration raids for a time. But Luftwaffe losses were high; 15% of crews were killed in the first three months of 1944.^[56]