 The artillery had also effectively halted the PVA assault against Hill 121, resulting in a fair degree of frustration among the Australian infantry, some of whom later expressed disappointment at being prevented from getting to grips with the PVA by the accurate New Zealand artillery fire.Before the battle, a section from the 2 RAR Medium Machine Gun Platoon had been stationed within the American perimeter near Hill 111 to provide covering fire across the area between the positions occupied by the Marines and the Australians.Commanded by Sergeant Brian Cooper they soon found themselves in the thick of the fighting, firing their Vickers machine guns in support of the Australian positions and to defend themselves from the weight of the PVA main attack which fell on the Marines.