A, B and D Companies attacked the Chinese units, and drew them away from Maryan San, the main objective. Following United Nations forces artillery and mortar fire, Chinese Troops withdrew from Maryan San, and the Australian troops moved to take the position. Australian troops moved against an area that was used by the Chinese for artillery bombardments, known as the Hinge. After taking the Hinge, they were subjected to constant attacks, which eventually became sporadic and died off. At about 8 pm, the Chinese launched an attack in huge numbers. The Australian units were well dug in, using the Chinese own trench positions, and responded to the waves of Chinese troops with machine gun fire. Chinese troops fell in their hundreds. South Korean porters moved forward constantly, bringing supplies and taking away wounded.