On 7 September, Kawaguchi issued his attack plan to "rout and annihilate the enemy in the vicinity of the Guadalcanal Island airfield". Kawaguchi's attack plan called for his forces, split into three divisions, to approach the Lunga perimeter inland, culminating with a surprise night attack. Oka's forces would attack the perimeter from the west while Ichiki's Second Echelon, now renamed the Kuma Battalion, would attack from the east. The main attack would be by Kawaguchi's "Center Body", numbering 3,000 men in three battalions, from the jungle south of the Lunga perimeter. By 7 September, most of Kawaguchi's troops had departed Taivu to begin marching towards Lunga Point along the coastline. About 250 Japanese troops remained behind to guard the brigade's supply base at Taivu.