A school teacher prior to the war, Bongartz was commissioned at Verdun where he served with an infantry regiment. After transferring to the Luftstreitkräft he was wounded five times before his days as a combat pilot ended. On 29 April 1918, Bongartz was shot down by an S.E.5a piloted by Clive Glynn. Despite a terrible facial wound which resulted in the loss of his left eye, Bongartz safely landed his Fokker DR.I.