Final answer:
The Cowra Breakout involved prisoners of Japanese nationality who attempted an escape from a POW camp in New South Wales, Australia during World War II.
Step-by-step explanation:
The prisoners who participated in the Cowra Breakout were predominantly of Japanese nationality. This notorious event took place during World War II, when over 1,000 Japanese prisoners of war attempted to escape from a prisoner of war camp near Cowra, in New South Wales, Australia, on August 5, 1944. The Cowra Breakout is an important episode in the history of World War II and reflects the intense national sentiments and desperation experienced by POWs.