The longest-range coastal pieces were the two guns of Batteries Hearn and Smith, with a horizontal range of . Although capable of an all around traverse, these guns, due to their flat trajectories, were not effective for use against targets on Bataan, as their maximum elevation was 35 degrees. During the siege, the island had ample armor-piercing ammunition but very little of the anti-personnel type, which then was of greatest demand for use against land targets on Bataan. In fact, most of the anti-personnel shells were only for the 12-inch mortars of Batteries Way and Geary. Battery Monja is located on Wheeler Point. It was operated by Battery G of the 92nd Coast Artillery Regiment, Philippine Scouts. The battery had two French 155mm GPF cannon, both of which were hidden in the sides of the island's bluffs. One gun was commanded by 2LT Robert L. Obourn, who claimed that, towards the end of the battle, "You could see the shells wobble towards the [enemy] ships. Our guns were reduced to nothing more than muskets." Obourn's gun was struck and destroyed on 28 April 1942, killing 2 of his gunners. The remaining crew of Battery Monja continued to fight against the Japanese as guerrillas until 18 July 1942. Only 6 men, including Lt. Obourn, survived their capture. The 5 enlisted men that were serving as gunners for the battery attempted to escape from their temporary prison camp two days after capture; they all were killed during their attempted escape. Battery Way, named for Lt. Henry N Way, which along with Battery Geary, was the mainstay of the Corregidor Garrison during the Japanese invasion. Its four mortars, capable of a 360-degree traverse, could fire on land targets at Bataan. They brought the most destruction on Japanese positions during the attempted landings on the southwest coast of Bataan late in January to the middle of February 1942. These mortars were silenced by enemy shelling in May 1942. Battery Geary was a battery of eight 13-ton, mortars. Defiladed in a hollow on Corregidor's Southern coast it was fairly well protected from Japanese shelling. However, on January 6, 1942, under the command of Capt. Ben Ewing King, a Japanese bomb landed in a makeshift temporary bunker killing 31 of Battery Geary's NCOs and canoneers. Early in the morning of January 26 Battery Geary opened fire on a unit of Japanese soldiers near Longaskawayan Point on the west side of the Bataan Peninsula.