With the entry of Great Britain and later the United States in the war against Japan, Wei was transferred to southern China to replace General Chen Cheng as commander of the Chinese XI Group Army and the Chinese Expeditionary Forces, known as Y-Force.
Wei was transferred to southern China. This was to replace General Chen Cheng as commander of the Chinese XI Group Army and the Chinese Expeditionary Forces, known as Y-Force. This was with the entry of Great Britain. This was with later the United States in the war against Japan.