South Pacific, Yamamoto agreed to allocate one carrier division to the operation against Port Moresby. Yamamoto also agreed to include an attack to seize strategic points in the Aleutian Islands simultaneously with the Midway operation, these were enough to remove the Japanese margin of superiority in the coming Midway attack. The attack on Port Moresby was codenamed the MO Operation and was divided into several parts or phases. In the first, Tulagi would be occupied on May 3, the carriers would then conduct a wide sweep through the Coral Sea to find and attack and destroy Allied naval forces, with the landings conducted to capture Port Moresby scheduled for May 10. The MO Operation featured a force of 60 ships led by the two carriers: and , one light carrier (), six heavy cruisers, three light cruisers, and 15 destroyers. Additionally, some 250 aircraft were assigned to the operation including 140 aboard the three carriers. However, the actual battle did not go according to plan, although Tulagi was seized on May 3, the following day, aircraft from the American carrier struck the invasion force. For the next two days, both the American and Japanese carrier forces tried unsuccessfully to locate each other. On May 7, the Japanese carriers launched a full strike on a contact reported to be enemy carriers, the report though turned out to be false. The strike force found and struck only an oiler, the and the destroyer . The American carriers also launched a strike on incomplete reconnaissance, instead of finding the main Japanese carrier force, they only located and sank the Shōhō. On May 8, the opposing carrier forces finally found each other and exchanged strikes. The 69 aircraft from the two Japanese carriers succeeded in sinking carrier Lexington and damaging Yorktown, in return the Americans damaged the Shōkaku. Although Zuikaku was left undamaged, aircraft losses to Zūikakū were heavy and the Japanese were unable to support a landing at Port Moresby. As a result, the MO Operation was cancelled. Although they managed to sink a carrier, the battle was a disaster for the IJN. Not only was the attack on Port Moresby halted, which constituted the first strategic Japanese setback of the war, all three carriers that were committed to the battle would now be unavailable for the operation against Midway. Midway Yamamoto perceived Operation MI, the capture of Midway, as the potentially decisive