 Between 1942 and 1943, many Chinese soldiers were airlifted from Chongqing to India and joined the ones who had followed the British retreat there earlier, they were trained under American advisors and became the X Force into which the New 1st Army and New 6th Army was incorporated, which was supported by American Special Forces in their field operations.For most of 1943, the Chinese Army engaged in several conflicts with the Japanese Army while defending the construction of the Ledo Road.In October 1943, the New First Army managed to defeat the Japanese veteran 18th Division at Hukawng Valley.