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The Messerschmitt Bf 110, often known non-officially as the Me 110, was 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 and others during World War II. Hermann Göring was a proponent of the Bf 110. It was armed with two MG FF 20 mm cannons, 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, the Polish, Norwegian and Battle of 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 When British bombers began targeting German territory with nightly raids, some Bf 110-equipped units were withdrawn and redeployed as night fighters, a role to which the aircraft was well suited.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.

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.

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. The Henschel Hs 124 was similar in construction layout to the Fw 57, 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.

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. 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 (actually, leading-edge slats).

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 12th May 1936, Rudolf Opitz flew the first Bf 110 out of Augsburg. 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 a respectable 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). 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.

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 centerline 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. 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.

Although the Me 210 entered service in mid-1941, it was withdrawn for further development. There were insufficient aircraft to fully replace the Bf 110, so it remained in service until the end of the war. In the wake of the failure of the Me 210, the Bf 110G was designed.Fitted with the 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 underwent some changes which improved the aerodynamics of the aircraft, as well as upgrading the nose armament and moving the rear cockpit access forward from the transversely-hinged, “tilt-open” rearmost canopy glazing (which was changed to a differently framed fixed section) 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, as the Bf 110 G-2 became the baseline Bf 110G and was fitted with a large number of Rüstsätze field conversion packs, 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 followed by 797 G-2, 172 G-3 and 2,293 G-4 models, built between December 1942 and April 1945. 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. However 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.

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 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, firing upward at an oblique angle for shooting down bombers while passing underneath, 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 utilized. The Schräge Musik weapons were typically mounted to the back 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 fighter-bomber versions could carry up to 2,000 kg (4,410 lb) of bombs, depending on the type.

Hermann Göring reportedly ordered the Zerstörerwaffe to make all the Luftwaffe’s Bf 110s available for operations. Future ace, commander of Nachtjagdgeschwader 1 and Jagdfliegerführer 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. 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.

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 23rd 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.[6] Just three weeks later, on 18 December 1939, the Bf 110 participated in the first German victory over British arms in World War II. 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. Actual losses were 11 Wellingtons and six damaged to varying degrees. Some sources claim a 12th Wellington was destroyed. The raid convinced RAF Bomber Command to consider abandoning the daylight bombing of Germany in favour of night actions.

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. The Bf 110s destroyed 25 Danish military aircraft stationed on the Værløse airbase on 9th April through ground strafing. One Danish Fokker C.V did manage to get airborne but was immediately shot down. 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.

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. 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.

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.

The Zerstörerwaffe performed well when it encountered mostly British bombers. On 13th 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. During July, the RAF made several raids on Norway. On 9th 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.

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.”

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 2nd April, when he shot down a Curtiss Hawk over Argonne. For the attack on the Netherlands, 145 Bf 110s were committed under Oberst Kurt-Bertram von Döring’s Jagdfliegerführer 2. During the campaign, the Bf 110 demonstrated its capabilities as a strike aircraft. On 10th May, ZG 1 claimed 26 Dutch aircraft destroyed on the ground on Haamstede airfield. Between 11th-13th May, most of the 82 aerial claims over Belgium were made by the Bf 110 equipped ZG 26. However, this was tempered by the loss of nine Bf 110s against the RAF on 15th May. By this date, Oberstleutnant Friedrich Vollbracht’s ZG 2 had claimed 66 Allied aircraft.

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. 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.

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. In the Western Campaign, 60 were lost. This represented 32 percent of the Zerstörerwaffe’s initial strength.

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 unique at the time as a long-range bomber escort, 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.

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 11th July 1940, when his Bf 110 was shot down by Hurricanes of No. 87 Squadron RAF. His aircraft crashed into Portland Harbour.

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

After the 18th 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.

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 4th and 27th September, 15 Bf 110s were lost on each day. The Luftwaffe had embarked on the battle with 237 serviceable Bf 110s. 223 were lost in the course of it.

On 10th 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.

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, 6th 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. Over Greece, on 20th 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 14th 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.

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” (Fliegerführer 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 26th May, no Bf 110s were left serviceable and German personnel were evacuated. 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. 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. Significantly, on the night of 22nd-23rd 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. On 29th 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. 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.

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 20th 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.

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.

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 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. 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.

The first victory for the Bf 110 in this capacity was recorded on 4th 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”.

On 4th March, the unit was back in action, this time destroying three B-17s for two Bf 110s. 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. 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. On 4th 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.