Georg-Hermann Greiner (2 January 1920 – 26 September 2014) was a Luftwaffe night fighter ace who served during World War II. Greiner was recipient of the Knight's Cross of the Iron Cross with Oak Leaves—the fourth highest German award by war's end. He was also a squadron commander in the prestigious Nachtjagdgeschwader 1 (NJG 1—Night Fighter Wing 1), the most successful night fighter interceptor unit of any nation in the history of aerial warfare.

Greiner primarily engaged British RAF Bomber Command crews in their bombing campaigns over German-occupied Europe and was credited with 51 aerial victories over Allied aircraft: four United States Army Air Force (USAAF) bombers during daylight hours and 47 Royal Air Force (RAF) aircraft at night. Only 23 other night fighter pilots—all German World War II serviceman—surpassed Greiner's total which was achieved in three years and six months of operations.

Following the conclusion of the War, Greiner and close friend Heinz-Wolfgang Schnaufer were arrested illegally crossing the German-Swiss border attempting an escape to Argentina. Both Greiner and Schnaufer were detained in an Allied prisoner of war camp and released in 1947. Greiner went on to study law and returned to service in the German Air Force in 1957, retiring with the rank of Oberstleutnant in 1972.For a list of Luftwaffe night fighter aces see List of German World War II night fighter aces.

Early life and career Greiner was born on 2 January 1920 in the small Bavarian town of Heidenheim, Middle Franconia. He was the third child of Albrecht and Sophie Greiner. His father moved away to Bochum, located in the German Ruhr to seek work with Reichsbank, Weimar Germany's central bank. Bochum was under the occupation of the French Army after World War I and there was a distinct lack of affordable housing. The family could not follow and the young Greiner rarely saw his father during his early childhood. When Albrecht had saved sufficient funds he was able to buy a flat in Bochum and he sent for his family. Greiner's father was a strict disciplinarian and the friction caused disharmony in the family. Greiner developed a strong desire to succeed in everything and prove himself worthy of his father's time.

Greiner joined the German Gymnasts Association (Deutscher Turner Bund) at seven and three years later the German Scout Movement (Deutscher Pfadfinder Bund). In 1933 he travelled to Switzerland and Italy with the scout movement at 13. Greiner had the opportunity to stay in Milan and Rome with German families. Greiner was unusually well travelled for a person of his age and social status at that time. In 1936 he was invited to participate at the International Youth Camp for the 1936 Summer Olympics in Berlin. Greiner received invitations to Hungary in 1937, Bulgaria in 1938 and Canada in 1939, but could only visit the Hungarian capital Budapest.

A consequence of the National Socialist rise to power in 1933 was Greiner's enforced membership in the Hitler Youth (Hitlerjugend). After four years in the organisation Greiner took an interest in aviation and joined the Flying Hitler Youth (Flieger Hitlerjugend), which was absorbed into the German Air Sports Association (Deutscher Luftsportscharen), in 1937. Here, Greiner passed the aptitude tests for a career as an officer in the Luftwaffe. All aspiring officers had to complete the Abitur. On 5 April 1938 he achieved the Abitur and then undertook six months of compulsory Reich Labour Service (Reichsarbeitsdienst).

Luftwaffe On 8 November 1938 he underwent basic training at the Second Pilot Replacement Unit at Detmold in Westphalia. He completed the course on 20 March 1939. At the conclusion of the course Greiner was rewarded with an acceptance as a Fahnenjunker (officer cadet). He was posted to the Luftkriegsschule 2 (LKS 2—2nd air war school) at Berlin-Gatow to begin flying lessons. There, he learned the rudiments of flying. Greiner flew the Focke-Wulf Fw 44, the Bücker Bü 131 and the Arado Ar 96. On 30 October 1939 he was granted his licence and pilot's badge, and A/B flying certificate, in recognition of his elementary training and qualification on advanced single-engine training aircraft.

Greiner moved to Saxony where he attended the Flugzeugführerschule C (Aircraft Advanced School C—advanced flying school) in Lönnewitz. At the school Greiner learned to fly the Heinkel He 111 and Junkers Ju 86. At this school he flew the Messerschmitt Bf 110 for the first time. Greiner attended the Long-Range reconnaissance school at Großenhain, followed by the Blindflugschule (Blind Flying School) at Neuburg an der Donau. From here Greiner was posted to the Zerstörerschule (Destroyer School) at Memmingen. Greiner then moved to the Jagdfliegerschule (Fighter School) at Schleißheim, near Munich. Finally, he completed his course at the Nachtjadgschule (Night Fighter School) at Stuttgart to learn the art of night fighting. Greiner flight training ended in September 1941.

World War II

World War II in Europe began on Friday, 1 September 1939, when German forces invaded Poland. Following the 1939 aerial Battle of the Heligoland Bight, Royal Air Force (RAF) attacks shifted to the cover of darkness, initiating the Defence of the Reich campaign. By mid-1940, Generalmajor (Brigadier General) Josef Kammhuber had established a night air defense system dubbed the Kammhuber Line. It consisted of a series of control sectors equipped with radars and searchlights and an associated night fighter. Each sector named a Himmelbett (canopy bed) would direct the night fighter into visual range with target bombers. In 1941, the Luftwaffe started equipping night fighters with airborne radar such as the Lichtenstein radar. This airborne radar did not come into general use until early 1942.

Night fighter career On 1 October 1941, Leutnant Greiner reported for duty with Nachtjagdgeschwader 1 (NJG 1—Night Fighter Wing 1) at Stade near Hamburg.For an explanation of the meaning of Luftwaffe unit designation see Organisation of the Luftwaffe during World War II. Greiner was assigned to II. Gruppe (2nd group) under the command of Gruppenkommandeur (group commander) Walter Ehle. Greiner was transferred to 4. Staffel (4th squadron) in mid-January 1942. Along with 6. Staffel it formed the nucleus of II. Gruppe of NJG 1, based at Leeuwarden, Netherlands. In February Greiner participated in Operation Donnerkeil (Thunderbolt), an air superiority mission to provide cover to the German Kriegsmarine (War Navy) and three major warships traversing the English Channel to bases in Germany. The battleships Scharnhorst and Gneisenau and the cruiser Prinz Eugen began the risky operation on 11 February. The naval component was called Operation Cerberus, and succeeded.

On 20 April 1942, Greiner was promoted to Oberleutnant (first lieutenant). In 1942 RAF Bomber Command, under the command of Air Officer Commanding, Arthur Harris, embarked on its long campaign of area bombing against German industrial cities and military targets. On the night of the 25/26 June 1942, 960 aircraft attacked Bremen, targeting the city, shipyards and the Focke-Wulf factory. 472 Vickers Wellington, 124 Handley-Page Halifax, 96 Avro Lancaster, 69 Short Stirling, 51 Bristol Blenheim, 50 Handley-Page Hampden, 50 Armstrong Whitworth Whitley, 24 Boston, 20 Avro Manchester and four de Havilland Mosquito bombers were used. A further 102 Lockheed Hudson and Wellington bombers of RAF Coastal Command were sent on the operation. Greiner was able to intercept a Wellington at daybreak, claiming it shot down south of Harlingen for his first victory at 06:00 with Bordfunker Rolf Kissing. On 6 October 1942, Greiner shot down his second victim west of Harlingen at 23:24. The bomber, a No. 103 Squadron RAF Halifax II, W1189, PM-E, crashed killing all the crew: Sergeants J. Porter, P. B. J. Butcher, R Carson, Pilot Officers R. Whitelock, A. G. Richards, B. C. H. King and Flight Sergeant B. J. Hardesty (RCAF seconded).

Greiner was ordered to report to the Nachtjagdschule at Echterdingen as an instructor. Greiner did not want to serve in a teaching role but as a pilot with only two victories in a year of operations, he had little choice. His Staffelkapitän (squadron leader) Hauptmann (Captain) Helmut Lent promised him a return to the Gruppe after six months. Greiner's stint as instructor began on 23 November 1942. He looked for an opportunity to fly on patrol but the school did not have the required technical equipment. One night in early March 1943, Greiner took off and claimed a Short Stirling shot down near Rastatt. The date and location were not recorded but it was officially granted as his third victory.

On 18 May 1943, Greiner returned to II. Gruppe of NJG 1 which from the 1 October 1942 had been re-designated IV. Gruppe of NJG 1. In March the British applied their area bombing and bomber stream tactics to the Ruhr. The Bomber Command attacks, which lasted until July 1943, were dubbed the Battle of the Ruhr. On the night of the 25/26 May Greiner claimed two Lancaster bombers that were part of a force attacking Düsseldorf. The first was accounted for west of Den Helder at 03:05 and the second north of Bergen aan Zee at 03:25 over North Holland. The claims were for Greiner's fourth and fifth victories which qualified him as a night fighter ace. One of the bombers was Lancaster I ED695, P-OJ, from No. 467 Squadron RAF. Flying Officer R. S. Giddey, Sergeant S. G. Keirs, W. V. Morris, R. V. Avaan, A.F Birkbeck, Pilot Officers K. R. Langhorne and P. R. Collins were reported missing in action. It transpired Langhorne and Birkbeck has been killed in action, the remainder of the crew were taken prisoner of war. On 1 June 1943 Greiner was awarded the Iron Cross 2nd Class ().

Greiner achieved the last of his successes in the Ruhr campaign the following month. On the night of the 5/6 July 1943, he intercepted a Short Stirling on a "Gardening" sortie. Northwest of Leeuwarden he claimed the only night victory of the Luftwaffe at 02:31. The bomber was Short Stirling III, EF436, AA-A, of No. 75 Squadron RNZAF. Sergeant William Edward Stobbs was killed with his crew. Greiner's last victory in the Ruhr campaign came on the 25 July 1943. This night Harris began Operation Gomorrha, a massed air attack on Hamburg. At 02:50 southwest of Den Helder, Greiner claimed a Halifax. This was most likely Lancaster I, ED878, PM-V, of No. 103 Squadron RAF. Warrant Officer F. F. O'Hanlon was killed with his crew when the bomber crashed west of the Frisian Islands.

On the night of the 3/4 August 1943 Greiner claimed his ninth and tenth aerial victories northwest of Schiermonnikoog at 03:06 and 03:48 The first was claimed as a Lancaster, the second as a Wellington. On 24 August Bomber Command mounted an attack on Berlin for the first time using ground-mapping radar. Greiner shot down a Halifax at 01:43 northwest of Berlin. He recorded his 12th victory over a Lancaster near Bergfeine at 23:48 on 22 September. The following night he claimed a Lancaster south of Lampertheim at 23:30. On the night of the 27 September 1943 Greiner intercepted a Halifax over the North Sea. As Greiner approached he saw the bomber was heavily damaged and flying on only two engines just above the waves. Greiner was amazed at the skill of the crew for flying this far. Greiner considered the condition of the bomber and crew, then rocked his wings in salute and flew back to base.

Squadron leader