 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.