On November 1, 1943, the Marine amphibious landing at Cape Torokina, Bougainville, was strongly resisted by the sole piece of artillery available to the Japanese defenders, a well-camouflaged 75 millimeter regimental gun. Strategically placed and protected within a coconut log bunker, the gun had already destroyed four landing craft and damaged ten others, seriously threatening the success of the operation. No boats could approach the beach without passing within 150 yards or less from the muzzle. The emplacement was so situated that it could only be attacked from the front and also in a position whereby rifle fire and grenades could not reach the gun crew.