Regiment (1,939 men) under command of Col. Shigeji Chikamori. Fearing an imminent invasion, the Japanese reinforced Wake Island with more formidable defenses. The American captives were ordered to build a series of bunkers and fortifications on Wake. The Japanese brought in an naval gun which is often incorrectly reported as having been captured in Singapore. The U.S. Navy established a submarine blockade instead of an amphibious invasion of Wake Island. The Japanese-occupied island (called Ōtorishima (大鳥島) or Big Bird Island by them for its birdlike shape) was bombed several times by American aircraft; one of these raids was the first mission for future United States President George H. W. Bush. After a successful American air raid by Task Force 14 on October 5, 1943, Sakaibara ordered the execution of all of the 98 captured Americans who remained on the island. They were taken to the northern end of the island, blindfolded and machine-gunned. One prisoner escaped, carving the message "98 US PW 5-10-43" on a large coral rock near where the victims had been hastily buried in a mass grave. This unknown American was soon recaptured and beheaded. Since the 1943 air raids, the garrison had been almost cut off from supplies and was reduced to the point of starvation. While the islands' sooty tern colony had received some protection as a source of eggs, the Wake Island rail was hunted to extinction by the starving soldiers. Ultimately about three-quarters of the Japanese garrison perished, and the rest survived only by eating tern eggs, the Polynesian rats introduced by prehistoric voyagers, and what scant amount of vegetables they could grow in makeshift gardens among the coral rubble. On September 4, 1945, the Japanese garrison surrendered to a detachment of United States Marines under the command of Brigadier General Lawson H. M. Sanderson. The garrison, having previously received news that Imperial Japan's defeat was imminent, exhumed the mass grave. The bones were moved to the U.S. cemetery that had been established on Peacock Point after the invasion. Wooden crosses were erected in preparation for the expected arrival of U.S. forces. During the initial interrogations, the Japanese claimed that the remaining 98 Americans on the island were mostly killed by an American bombing raid, though some escaped and fought to the death after being cornered on the beach at the north end of Wake Island. Several Japanese officers in American custody committed