As he advanced across Guam, Marine Joseph Hiott encountered the Japanese "knee mortar." It was an effective weapon, though misnamed, he says. It would break your leg if you set it on your knee. Island fighting in the Pacific meant battling your enemy face to face. In the jungle and mountain terrain, the weaponry was limited to the M-1 rifle, the .30 cal light machine gun, and mortars. (5:38)