 In total, more than 3,000 PVA troops had assaulted the front held by the 1st Marine Division during the night of 24/25 July.Throughout the night the 11th Marine Regiment had been heavily engaged, with the regiment and the 10 battalions under its operational control in the 1st Marine Division sector firing a total of 23,725 rounds, including those from batteries of the US 25th Infantry Division Artillery, the US I Corps Artillery and the 1st Commonwealth Divisional Artillery.The weight of indirect fire available to the defenders had been significant and the whole of the 1st Commonwealth Divisional Artillery (80 guns) had also been engaged during the fighting, firing in support of both the Australians on Hill 121 and the Marines on their left flank, defending Hill 111 and Boulder City.