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On 6 April 1917, the United States entered the war. It was also the day that Bertrab, flying his purple Albatros D.III with its unique comet insignia, shot down four British aircraft in three hours. His fifth and final victory was achieved a month later. The war ended for Bertrab on 12 August 1917. While attacking a balloon, his Albatros D.V was shot down by a Nieuport piloted by Edward Mannock. Bertrab survived but was captured.
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