Original: Most of the detainees were captured Japanese and Italian military personnel, On August 5, 1944 at least 545 (some sources suggest over 1000) Japanese POWs attempted a mass breakout from the camp, in perhaps the largest prison escape in world history.
Simplified: On August 5, 1944  about 545 (some sources say over 1000) Japanese POWs attempted a mass escape from the camp.