Meanwhile, on February 8 and 9, three Japanese divisions had landed on Singapore Island; and on February 15 they forced the 90,000-strong British, Australian, and Indian garrison there, under Lieutenant General A.E. Percival, to surrender. Singapore was the major British base in the Pacific and had been regarded as unassailable due to its strong seaward defenses. The Japanese took it with comparative ease by advancing down the Malay Peninsula and then assaulting the base’s landward side, which the British had left inadequately defended. On February 13, moreover, Japanese paratroopers had landed at Palembang in Sumatra, which fell to an amphibious assault three days later.

When ABDACOM was dissolved on February 25, 1942, only Java remained to complete the Japanese program of conquest. The Allies’ desperate attempt to intercept the Japanese invasion fleet was defeated in the seven-hour Battle of the Java Sea on February 27, in which five Allied warships were lost and only one Japanese destroyer damaged. The Japanese landed at three points on Java on February 28 and rapidly expanded their beachheads. On March 9 the 20,000 Allied troops in Java surrendered. In the Indian Ocean, the Japanese captured the Andaman Islands on March 23, and began a series of attacks on British shipping. After the failure of ABDACOM, the U.S.–British Combined Chiefs of Staff placed the Pacific under the U.S. Joint Chiefs’ strategic direction. MacArthur became supreme commander of the Southwest Pacific Area, which comprised the Dutch East Indies (less Sumatra), the Philippines, Australia, the Bismarck Archipelago, and the Solomons; and Admiral Chester W. Nimitz became commander in chief of the Pacific Ocean Areas, which comprised virtually every area not under MacArthur. Their missions were to hold the U.S.–Australia line of communications, to contain the Japanese within the Pacific, to support the defense of North America, and to prepare for major amphibious counteroffensives.

Japan’s initial war plans were realized with the capture of Java. But despite their military triumphs, the Japanese saw no indication that the Allies were ready for a negotiated peace. On the contrary, it seemed evident that an Allied counterstroke was in the making. The U.S. Pacific Fleet bombed the Marshall Islands on February 1, 1942, Wake Island on February 23, and Marcus Island (between Wake and Japan) on March 1. These moves, together with the bombing of Rabaul on February 23 and the establishment of bases in Australia and a line of communications across the South Pacific, made the Japanese decide to expand so as to cut the Allied line of communications to Australia. They planned to occupy New Caledonia, the Fiji Islands, and Samoa and also to seize eastern New Guinea, whence they would threaten Australia from an air base to be established at Port Moresby. They planned also to capture Midway Island in the North Pacific and to establish air bases in the Aleutians. In pursuance of this new program, Japanese troops occupied Lae and Salamaua in New Guinea and Buka in the Solomon Islands in March 1942 and Bougainville in the Solomons and the Admiralty Islands (north of New Guinea) early in April.

Something to raise the Allies’ morale was achieved on April 18, 1942, when 16 U.S. bombers raided Tokyo—though they did little real damage except to the Japanese government’s prestige. Far more important were the consequences of the U.S. intelligence services’ detection of Japanese plans to seize Port Moresby and Tulagi (in the southern Solomons). Had these two places fallen, Japanese aircraft could have dominated the Coral Sea. In the event, after U.S. aircraft on May 3, 1942, had interfered with the Japanese landing on Tulagi, U.S. naval units, with aircraft, challenged the Japanese ships on their circuitous detour from Rabaul to Port Moresby. On May 5 and 6 the opposing carrier groups sought each other out, and the four-day Battle of the Coral Sea ensued. On May 7 planes from the Japanese carriers sank a U.S. destroyer and an oil tanker, but U.S. planes sank the Japanese light carrier Shoho and a cruiser; and the next day, though Japanese aircraft sank the U.S. carrier Lexington and damaged the carrier Yorktown, the large Japanese carrier Shokaku had to retire crippled. Finally, the Japanese lost so many planes in the battle that their enterprise against Port Moresby had to be abandoned.

Despite the mixed results of the Battle of the Coral Sea, the Japanese continued with their plan to seize Midway Island. Seeking a naval showdown with the remaining ships of the U.S. Pacific Fleet and counting on their own numerical superiority to secure a victory, the Japanese mustered four heavy and three light aircraft carriers, two seaplane carriers, 11 battleships, 15 cruisers, 44 destroyers, 15 submarines, and miscellaneous small vessels. The U.S. Pacific Fleet had only three heavy carriers, eight cruisers, 18 destroyers, and 19 submarines, though there were some 115 aircraft in support of it. The Americans, however, had the incomparable advantage of knowing the intentions of the Japanese in advance, thanks to the U.S. intelligence services’ having broken the Japanese Navy’s code and deciphered key radio transmissions. In the ensuing Battle of Midway, the Japanese ships destined to take Midway Island were attacked while still 500 miles from their target by U.S. bombers on June 3. The Japanese carriers were still able to launch their aircraft against Midway early on June 4, but in the ensuing battle, waves of carrier- and Midway-based U.S. bombers sank all four of the Japanese heavy carriers and one heavy cruiser. Appalled by this disaster, the Japanese began to retreat in the night of June 4–5. Though the U.S. carrier Yorktown was sunk by torpedo on June 6, Midway was saved from invasion. In the Aleutians, the Japanese bombed Dutch Harbor effectively and on June 7 occupied Attu and Kiska.

The Battle of Midway was probably the turning point of the war in the Pacific, for Japan lost its first-line carrier strength and most of its navy’s best trained pilots. Henceforth, the naval strengths of the Japanese and of the Allies were virtually equal. Having lost the strategic initiative, Japan canceled its plans to invade New Caledonia, Fiji, and Samoa.

The Chinese front and Burma, 1941–42

Japan’s entry into war against the western Allies had its repercussions in China. Chiang Kai-shek’s government on December 9, 1941, formally declared war not only against Japan (a formality long overdue) but also, with political rather than military intent, against Germany and Italy. Three Chinese armies were rushed to the Burmese frontier, since the Burma Road was the only land route whereby the western Allies could send supplies to the Nationalist Chinese government. On January 3, 1942, Chiang was recognized as supreme Allied commander for the China theatre of war; and a U.S. general, Joseph W. Stilwell, was sent to him to be his chief of staff. In the first eight weeks after Pearl Harbor, however, the major achievement of the Chinese was the definitive repulse, on January 15, 1942, of a long-sustained Japanese drive against Ch’ang-sha, on the Canton–Han-k’ou railway.

Thereafter, Chiang and Stilwell were largely preoccupied by efforts to check the Japanese advance into Burma. By mid-March 1942 two Chinese armies, under Stilwell’s command, had crossed the Burmese frontier; but before the end of the month the Chinese force defending Toungoo, in central Burma between Rangoon and Mandalay, was nearly annihilated by the more soldierly Japanese. British and Indian units in Burma fared scarcely better, being driven into retreat by the enemy’s numerical superiority both in the air and on the ground. On April 29 the Japanese took Lashio, the Burma Road’s southern terminus, thus cutting the supply line to China and turning the Allies’ northern flank. Under continued pressure, the British and Indian forces in the following month fell back through Kalewa to Imphāl (across the Indian border), while most of the Chinese retreated across the Salween River into China. By the end of 1942 all of Burma was in Japanese hands, China was effectively isolated (except by air), and India was exposed to the danger of a Japanese invasion through Burma.

Since the U.S. bombers that raided Tokyo on April 18 flew on to Chinese airfields, particularly to those in Chekiang (the coastal province south of Shanghai), the Japanese reacted by launching a powerful offensive to seize those airfields. By the end of July they had generally achieved their objectives.