Post-war investigations revealed that from the beginning of Allied air attacks on Clark, Nichols, and Nielson fields in October 1944 until February 1945, 1,505 Japanese aircraft were put out of action on the ground. At Clark, the heavy bomber attacks had caused the Japanese to disperse repair shops, storage areas, and maintenance units, scattering them as far as Bamban. Sometimes, parts were hidden or even buried, often becoming inaccessible later. One captured Japanese aircraft needed only one of the carburetors buried at Mabalacat to be ready for flight. In fact, when Allied troops captured Mabalacat, they found over 200 aircraft engines, some of which had never been uncrated.