The night of 31 July - 1 August turned out to be the busiest of 1/8 and the 8th Regiment. The entire division's success depended on the 8th Marines success of reaching the heights of Objective O-8A. The going was tough due to the steep climb, but by the afternoon a platoon from A Company followed by a platoon from C Company 1/8 made a breakthrough and reached the summit. That night the Japanese launched a vicious local counterattack against 1/8's left. The situation was touch and go for a short time, one section of the Marines' front was even forced back a few yards, but the attackers were too few for the task they had assumed, and the Marines overcame the assault. Japanese counterattacks continued throughout the night, probing at 1/8's gaps in the line. They solved the issue by stringing concertina wire between foxholes.