The landings at the Lingayen Gulf on 9 January were carried out by the 6th Army under the command of General Walter Krueger. Approximately 175,000 troops from the 6th Army landed along the 20-mile (32 km) beachhead within a few days, while the I Corps protected their flanks. XIV Corps under General Oscar Griswold then advanced south toward Manila, despite Krueger's concerns that his eastern flank was unprotected and vulnerable if the Japanese forces attacked.