After five years in the Merchant Navy, Schoenert began flight training in 1933 and went on to fly commercial aircraft for Lufthansa. He was commissioned as a Leutnant in the Luftwaffe's Reserve in 1938 and in June 1941 joined 4./Nachtjagdgeschwader 1 at Bergen in northern Holland. He was credited with his first aerial victory on the night of 8/9 July 1941 when he claimed an Armstrong Whitworth Whitley bomber shot down at 02:51 northwest of Vlieland. His total stood at 22 by 25 July 1942 and he was awarded the Knight's Cross. Schoenert is recognised as the instigator of upward-firing armament in German night fighter aircraft, which he introduced into his own Dornier Do 17 in 1942. The concept, dubbed Schräge Musik, was initially rejected by Helmut Lent and Werner Streib. Oberfeldwebel Paul Mahle, an armourer attached to II./Nachtjagdgeschwader 5 at Parchim, worked closely with Rudolf Schoenert and built his own working prototype of Schräge Musik, which was soon fitted to all of the Gruppe's aircraft. Schoenert claimed the first aerial victory with Schräge Musik in May 1943. By August he was flying with Nachtjagdgeschwader 100 over the Eastern Front, where he claimed to have shot down 30 Soviet aircraft by early 1944. While there, he utilised a Junkers Ju 87D-5 "Stuka" dive-bomber with the configuration in an effort to target the slow-flying Soviet biplane fighter-bombers. On 11 April 1944, Schoenert was awarded the Knight's Cross of the Iron Cross with Oak Leaves, the 450th soldier to receive this distinction. The presentation was made by Adolf Hitler at the Berghof, Hitler's residence in the Obersalzberg of the Bavarian Alps, on 5 May 1944. Schoenert and Leutnant Karl Schnörrer, Oberst Gordon Gollob, Major Georg Christl, Hauptmann Heinz Strüning, MajorJosef Fözö formed the guard of honor at Walter Nowotny funeral at the Zentralfriedhof in Vienna. Nowotny had been killed in action on 8 November 1944. The eulogy was delivered by GeneralleutnantAdolf Galland and Generaloberst Otto Deßloch. During a sortie east of the Elbe on 27 April 1945, an electrical fault rendered Schonert's radar unserviceable and his Junkers Ju 88G was shot down by a Royal Air Forcede Havilland Mosquito. He survived and was rescued by German troops. Schoenert survived the war. Schoenert's radio and wireless operator was usually Oberfeldwebel Johannes Richter.
Summary of career
Aerial victory claims
Schoenert was credited with 65 aerial victories claimed in 376 combat missions, including 35 Soviet aircraft on the Eastern Front.