Corregidor in the context of "Japanese occupation of the Philippines"

Caballo Island (which means "Horse Island" in Spanish) is a bluff, rocky island located at the entrance to Manila Bay in the Philippines. It is about 1.2 km (0.75 mi) long with the highest elevation at 381 feet high. Caballo, along with the larger Corregidor (2 km to the north), divides the entrance to the bay into two broad and deep channels, known as the North and South Channel.

The whole island was formerly occupied by Fort Hughes, a U.S. defense fortification before World War II. It was heavily bombed during the war.

The Battle of Bataan (Filipino: Labanan sa Bataan; 7 January – 9 April 1942) was fought by the United States and the Philippine Commonwealth against the Empire of Japan during World War II. The battle represented the most intense phase of the Japanese invasion of the Philippines during World War II. In January 1942, forces of the Imperial Japanese Army and Navy invaded Luzon along with several islands in the Philippine Archipelago after the bombing of the American naval base at Pearl Harbor.

The commander in chief of the U.S. and Filipino forces in the islands, General Douglas MacArthur, consolidated all of his Luzon-based units on the Bataan Peninsula to fight against the Japanese army. By this time, the Japanese controlled nearly all of Southeast Asia. The Bataan Peninsula and the island of Corregidor were the only remaining Allied strongholds in the region.