Originally the "104th division" was sent for the escalating Battle of Lake Khasan on Soviet border, but the battle was finished 11 August 1938. Therefore, the "104th division" was attached to 21st Army on 19 September 1938 and sailed from Dalian on 4 October 1938. It arrived in Daya Bay on 12 October 1938. The 137th Infantry Regiment then landed and proceeded inland to isolate Hong Kong, as part of the large-scale Canton Operation. Afterwards, the main garrison of the 104th Division was established in Conghua District. On 9 February 1940 the 21st Army was dissolved and the 104th Division was reassigned to the Southern China Area Army.