The ultimately unsuccessful Japanese attempt to capture Port Moresby in May 1942 is commonly referred to as the “battle of the Coral Sea.” Almost all fo- cus is usually given to the decisive tactical engagement between carrier forces. However, the Japanese effort was officially code-named Moresby Operation and was often called the “Port Moresby–Solomons operation.” In formal terms, it was on the Japanese side a major offensive and joint operation, planned and executed to achieve an op- erational objective—the capture of Port Moresby, on the Australian territory of New Guinea (now Papua New Guinea). For the Allies, in contrast, “the battle of the Coral Sea” was a major defensive and joint opera- tion aimed at preventing an enemy landing at Port Moresby. Both U.S. and Australian naval forces and land-based aircraft took part.
"The Port Moresby–Solomons Operation and the Allied Reaction, 27 April–11 May 1942,"
Naval War College Review: Vol. 65
, Article 6.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol65/iss1/6