"Kongō" and "Haruna" departed from the Hashirajima fleet anchorage on 29 November 1941 to begin the War in the Pacific as part of the Southern (Malay) Force's Main Body, under the overall command of Vice-Admiral Nobutake Kondō. On 4 December 1941, the Main Body arrived off the coast of southern Thailand and northern Malaya in preparation for the invasion of Thailand and the Malayan Peninsula four days later. When Britain's "Force Z"—consisting of the battleship and the battlecruiser —was quickly defeated by Japan's land-based aircraft from southern Vietnam, "Kongō"s battlegroup withdrew from Malayan waters. This battlegroup subsequently sortied from Indochina for three days in mid-December to protect a reinforcement convoy traveling to Malaya, and again on 18 December to cover the Japanese Army's landing at Lingayen Gulf, Luzon, in the Philippines. The Main Body departed Cam Ranh Bay in French Indochina on 23 December bound for Taiwan, arriving two days later. In January 1942, "Kongō" and the heavy cruisers and provided distant cover for air attacks on Ambon Island.