 <unk> 's Center Body of troops was planning to attack the <unk> perimeter at the ridge , which they called " the <unk> " ( <unk> <unk> ) because of its shape . On 9 September , <unk> 's troops left the coast at <unk> Point . <unk> into four columns , they marched into the jungle towards their <unk> attack points south and southeast of the airfield . <unk> of good maps , at least one faulty <unk> , and thick , almost impenetrable jungle caused the Japanese columns to proceed slowly and <unk> , costing a lot of time . At the same time , <unk> 's troops approached the <unk> perimeter from the west . <unk> had some intelligence on the Marine defenses , extracted from a U.S. Army pilot captured on 30 August . 
