 He survived after fleeing, on 18 January 1945, during one of the notorious death marches that took place just before the camp's liberation, when the SS forced inmates to move to different camps.Wulf's wife and son survived the war by hiding with Polish peasants, but he lost his father, mother, brother, mother-in-law, and young niece.At the end of the war, Wulf remained in Poland, where from 1945 to 1947 he co-founded the Central Jewish Historical Commission, publishing documents about Nazi Germany.