On the night of 12 September, Kawaguchi's 1st Battalion attacked the Raiders between the Lunga River and ridge, forcing one Marine company to fall back to the ridge before the Japanese halted their attack for the night. The next night Kawaguchi faced Edson's 830 Raiders with 3,000 troops of his brigade plus an assortment of light artillery. The Japanese attack began just after nightfall, with Kawaguchi's 1st battalion assaulting Edson's right flank just to the west of the ridge. After breaking through the Marine lines the battalion's assault was eventually stopped by Marine units guarding the northern part of the ridge.