Overview
The Battle of the Coral Sea, fought between 4 and 8 May 1942, marked a turning point in the Pacific War and introduced a new era of naval warfare. It was the first major naval battle in history where opposing fleets never exchanged direct gunfire, with aircraft launched from aircraft carriers becoming the decisive weapon. The clash took place in the Coral Sea, northeast of Australia, as Japan sought to capture Port Moresby in New Guinea, threatening Australia and expanding its defensive perimeter.
Japanese forces, commanded by Vice Admiral Shigeyoshi Inoue, assembled a powerful invasion fleet protected by the carriers Shōkaku and Zuikaku. Opposing them was an Allied task force led by Rear Admiral Frank Jack Fletcher, centred on the American carriers USS Yorktown and USS Lexington. Thanks to intelligence gained from broken Japanese naval codes, the Allies knew the invasion was imminent and positioned their forces to intercept the advance before Port Moresby could be seized.
Over several days, carrier aircraft searched vast stretches of ocean before launching devastating strikes. On 7 May, American aircraft mistakenly sank the light carrier Shōhō, prompting the famous radio message, "Scratch one flattop." The following day, both sides launched large-scale attacks. USS Lexington suffered catastrophic explosions and was later scuttled, while USS Yorktown was damaged but survived. Shōkaku was heavily bombed, and Zuikaku lost so many aircraft that neither carrier could participate in the forthcoming Battle of Midway.
Although Japan claimed a tactical victory because the United States lost more tonnage, the strategic outcome favoured the Allies. The invasion of Port Moresby was abandoned, removing an immediate threat to Australia and preserving a vital Allied base. Even more importantly, the damage inflicted on Japan's carrier force weakened its striking power just weeks before Midway, where the Imperial Japanese Navy suffered a decisive defeat. The Battle of the Coral Sea demonstrated the growing dominance of naval aviation and altered the course of the Pacific campaign.