 Meanwhile, Zhang Zuolin ordered a detachment of his troops to enter Shanhaiguan, taking up positions at Horse Factory (Machang, 马厂) and Military Grain City (Junliangcheng, 军粮城).On July 14, 1920, the Anhui army attacked the Zhili army on both fronts.Zhili troops were forced to abandon Gaobei (高碑) Hotel and retreated.