On the night of 12 September, Kawaguchi's 1st Battalion attacked the Raiders between the Lunga River and ridge. One Marine company had to fall back to the ridge before the Japanese stopped their attack for the night. The next night Kawaguchi had to battle Edson's 830 Raiders with 3,000 troops of his brigade and artillery. The Japanese attack began just after nightfall with Kawaguchi's 1st battalion attacking Edson's right side to the west of the ridge. After breaking through the Marine defences, the attack was eventually stopped by Marine units guarding the northern part of the ridge.