barbed wire fences surrounded the camp, in addition to multiple pillbox bunkers and four-story guard towers. At its peak, the camp held 8,000 American soldiers (along with a small number of soldiers and civilians from other nations including the United Kingdom, Norway, and the Netherlands), making it the largest POW camp in the Philippines. This number dropped significantly as able-bodied soldiers were shipped to other areas in the Philippines, Japan, Japanese-occupied Taiwan, and Manchukuo to work in slave labor camps. As Japan had not ratified the Geneva Convention, the POWs were transported out of the camp and forced to work in factories to build Japanese weaponry, unload ships, and repair airfields. The imprisoned soldiers received two meals a day of steamed rice, occasionally accompanied by fruit, soup, or meat. To supplement their diet, prisoners were able to smuggle food and supplies hidden in their underwear into the camp during Japanese-approved trips to Cabanatuan. To prevent extra food, jewelry, diaries, and other valuables from being confiscated, items were hidden in clothing or latrines, or were buried before scheduled inspections. Prisoners collected food using a variety of methods including stealing, bribing guards, planting gardens, and killing animals which entered the camp such as mice, snakes, ducks, and stray dogs. The Filipino underground collected thousands of quinine tablets to smuggle into the camp to treat malaria, saving hundreds of lives. One group of Corregidor prisoners, before first entering the camp, had each hidden a piece of a radio under their clothing, to later be reassembled into a working device. When the Japanese had an American radio technician fix their radios, he stole parts. The prisoners thus had several radios to listen to newscasts on radio stations as far away as San Francisco, allowing the POWs to hear about the status of the war. A smuggled camera was used to document the camp's living conditions. Prisoners also constructed weapons and smuggled ammunition into the camp for the possibility of securing a handgun. Multiple escape attempts were made throughout the history of the prison camp, but the majority ended in failure. In one attempt, four soldiers were recaptured by the Japanese. The guards forced all prisoners to watch as the four soldiers were beaten, forced to dig their own graves and then executed. Shortly thereafter, the guards put up signs declaring that if other escape attempts were made, ten prisoners would be executed for every