Clausen reached his 100th victory by shooting down an Il-2 on 22 July 1942. He was the 12th Luftwaffe pilot to achieve the century mark.[2] He was awarded Oak Leaves to his Knight's Cross the next day. He was transferred to the Ergänzungs-Jagdgruppe Süd on 1 February 1943, and later, promoted to Hauptmann, he became a Gruppenkommandeur of I./Jagdgeschwader 11 on 20 June 1943. This unit carried out Reichsverteidigung (Defense of the Reich) duties. On 4 October 1943 he shot down a B-24 Liberator but then was killed in aerial combat over the North Sea in his Fw 190 A-5.
Clausen was credited with 132 aerial victories with some unconfirmed victories in 561 combat missions. He recorded one victory over Poland, three over Yugoslavia (these being Hawker Fury fighters of the 36th Fighter Group shot down over Režanovačka Kosa airfield near Kumanovo on 6 April 1941), 14 victories over the Western Front with the remaining victories achieved over the Eastern Front.[3] He was posthumously promoted to Major. Three of his brothers were killed in action during World War II.[4]
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