中国派遣军
With the start of the Second Sino-Japanese War in 1937, Yamada was named commander of the IJA 12th Division, based in Manchukuo. During that period, the 12th Division was an elite unit, with a disproportionately large amount of firepower and heavy equipment. He became commander of the IJA 3rd Army in 1938, and that of the Central China Expeditionary Army from 1938 to 1939.