On March 8th, the 200th Division of Chinese Expeditionary Force arrived in Dongyu under the command of Dai Anlan, a teacher, to accept the defense of British and Burmese troops and cover their retreat. Dai Anlan 1904 was born in Wuwei, Anhui Province, and 1924 was admitted to the third phase of Huangpu Military Academy. Later, he took part in the 1 expedition to the east and the northern expedition. He has served as platoon leader, company commander, battalion commander, colonel, brigade commander and deputy division commander, and led his troops to participate in battles such as Taierzhuang Campaign and Wuhan Campaign, with rich combat experience. Before Dai Anlan entered the war, Chiang Kai-shek summoned him. When Chiang Kai-shek asked Dai Anlan: Can we persist in going deep alone? Dai Anlan said firmly: "This expedition is a grand show of force since Tang Ming. Although we fought to a single soldier, we will also swear to defend Xu Dong. "