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Continuity mistake: When the Privates are having their furloughs authorised, Colonel Sangston walks in with Corporal Cannon. Only those two men walk in. Corporal Cannon moves from the doorway to give Desmond Doss his rifle leaving no-one by the doorway. After Desmond refuses to touch the rifle, the Colonel shouts at Desmond. Out of nowhere Captain Glover mysteriously appears in the doorway. (00:48:40 - 00:50:10)
Chosen answer: US troops put the net up (in reality the ridge isn't as tall). The Japanese were fighting a defensive battle from heavily fortified positions on a reverse slope, and it suited them to have the Americans attacking from that point. The Americans also used ladders on other parts of the escarpment.