居庸关
Following the loss of Peiking, Tang Enbo's 13th Corps (4th and 89th Divisions) took up positions in depth along the Peiking – Suiyuan Railway at Nankou, and further to the rear at Juyongguan (Juyong Pass). Gao's 17th Corps stationed its 84th Division at Chihcheng, Yanqing, and Lungkuan, covering the flank of the 13th Corps from Japanese forces in Chahar. The 21st Division was deployed in Huailai, on the railroad to the rear of Tang's forces. Zhao Cheng-shou's 1st Cavalry Corps, Liu Ru-ming's 143rd Division, and two Peace Preservation Brigades began an attack on the Mongol forces in northern Chahar.