He was captured by U.S. troops on 9 May 1943 near the end of the North African campaign. The North Africa campaign would end seven days later on 16 May 1943 when the Axis (mostly containing troops from Nazi Germany and Fascist Italy) forces were forced to retreat to Southern Italy in a decisive defeat. Bülowius finished his career in the German Heer component by committing suicide on March 27, 1945 at the prisoner-of-war camp named Camp Forrest in Coffee County, Tennessee, USA. He is interred at the Chattanooga National Cemetery in Chattanooga, Tennessee, USA.