Malintâ Tunnel, bored into the island’s rock, became government and military nerve center. Packed in its main and lateral tunnels were offices, hospital, sleeping quarters, ammo, and food storage, everything. Corregidor was the largest of the islands at Manila Bay’s entrance. Strengthened starting in 1909 to prevent invasion by sea (no planes or missiles yet), Corregidor became Fort Mills; El Fraile near Ternate, Cavite was leveled and the concrete Fort Drum was built, shaped like a battleship 110 meters long; Caballo became Fort Hughes; and Carabao, Fort Frank. La Monja and Los Cochinos, small islands near the Bataán shore, were likewise secured. Grande Island at the entrance to Subic Bay was fortified into Fort Wint.

Laya, J. (2021, February 22). War and Romance on Manila Bay. Manila Bulletin, p. B-7.