On 17 November, a Chinese counterattack surprised the invaders and led to a disorganized retreat back to their headquarters at Bailingmiao, where the Mongolians tried to regroup. Taking advantage of the Mongolian disorder, General Fu Zuoyi's 35th Army made a flanking movement to the west of the Mongolian headquarters at Bailingmiao and later attacked it. The Chinese first launched suicide attacks until the city gates were broken through with some trucks. They then proceeded to drive the defending Inner Mongolian 7th Cavalry Division from Bailingmiao, giving them heavy casualties. The Mongols lost three hundred to nine hundred killed, three hundred wounded, and three hundred captured. A large amount of supplies also fell into Nationalist hands, including bags of flour, cans of petrol, rifles, machine guns, motor vehicles and field guns. The vehicles and artillery pieces were later presented as evidence of Japan's involvement in the operation.