In 1947, Godwin was seconded to the
Australian Army, with the rank of
captain, and was assigned to the Second Australian War Crimes Section (AWCS) as an investigator, based in
Tokyo. Australian military courts were tasked with trying persons who had perpetuated war crimes against Australian and British subjects. As a prisoner during the war, Godwin had acquired some understanding of the Japanese language which helped his work. He investigated a number of
war crimes, including murders of POWs. The investigation work of the AWCS was stressful, with staff overworked and under resourced. A major case involved the mass execution and cremation of 155 wounded Australian and Indian soldiers in
Malaya, in what is known as the
Parit Sulong Massacre. This eventually resulted in the hanging of Lieutenant General
Takuma Nishimura, commander of the Imperial Guards Division, in 1951. Godwin collected affidavits from three Japanese soldiers which supported the Australian position that Nishimura ordered the POWs be executed. Nishimura in turn argued that he gave no such order and that his instructions were to turn the POWs over to the headquarters of
General Tomoyuki Yamashita, his superior officer in Malaya. ==Later life==