Due to heavy Allied air attacks on Manila, the two warships unloaded their supplies in the Spratly Islands from 14 November. They sailed for Lingga Roads near Singapore on the 20th of the month and arrived there two days later. The Allies learned from intelligence gained by decrypting Japanese radio signals that the battleship-carriers had sailed. Allied submarines were ordered to keep watch for the ships, but did not intercept "Ise" or "Hyūga" during their voyage to Singapore. The two battleship-carriers were deployed to Cam Ranh Bay in Indochina during December and returned to Singapore on 11 January 1945. The U.S. Third Fleet raided the South China Sea between 10 and 20 January in search of the Japanese fleet, but did not locate "Ise" or "Hyūga".