 Complete the following phrase:  With the start of the Second Sino-Japanese War 27 July 1937, the 6th Division was assigned to the Japanese China Garrison Army, and immediately started to act in the ongoing Battle of BeipingTianjin. Afterward, it participated in BeipingHankou Railway Operation. 20 October 1937, the division was re-subordinated to the 10th Army and attacked the Chinese troops concentration at Hangzhou Bay. By December 1937, it shifted west to participate together with the 18th Division and 114th Division in the 