 From a strategic perspective, however, the battle was an Allied victory as it averted the seaborne invasion of Port Moresby, lessening the threat to the supply lines between the U.S. and Australia.Although the withdrawal of "Yorktown" from the Coral Sea conceded the field, the Japanese were forced to abandon the operation that had initiated the Battle of Coral Sea in the first place.The battle marked the first time that a Japanese invasion force was turned back without achieving its objective, which greatly lifted the morale of the Allies after a series of defeats by the Japanese during the initial six months of the Pacific Theatre.