In the Philippines, the Japanese pushed the combined American-Filipino force towards the Bataan Peninsula and later the island of Corregidor. By January 1942, General Douglas MacArthur and President Manuel L. Quezon were forced to flee in the face of Japanese advance. This marked one of the worst defeats suffered by the Americans, leaving over 70,000 American and Filipino prisoners of war in the custody of the Japanese. On February 15, 1942, Singapore, due to the overwhelming superiority of Japanese forces and encirclement tactics, fell to the Japanese, causing the largest surrender of British-led military personnel in history. An estimated 80,000 Australian, British and Indian troops were taken as prisoners of war, joining 50,000 taken in the Japanese invasion of Malaya (modern day Malaysia). The Japanese then seized the key oil production zones of Borneo, Central Java, Malang, Cebu, Sumatra, and Dutch New Guinea of the late Dutch East Indies, defeating the Dutch forces. However, Allied sabotage had made it difficult for the Japanese to restore oil production to its pre-war peak. The Japanese then consolidated their lines of supply through capturing key islands of the Pacific, including Guadalcanal.