Hosenfeld was drafted into the Wehrmacht in August 1939 and was stationed in Poland from mid-September 1939 until his capture by the Soviet Army on 17 January 1945.
Hosenfeld bergabung dengan Wehrmacht pada Agustus 1939 dan ditempatkan di Polandia sejak September 1939, sampai ditangkap tentara Soviet pada 17 Januari 1945.