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 .