 General MacArthur provided Australian Prime Minister John Curtin with his assessment of the battle, stating that "all the elements that have produced disaster in the Western Pacific since the beginning of the war" were still present as Japanese forces could strike anywhere if supported by major elements of the IJN.Because of the severe losses in carriers at Midway, the Japanese were unable to support another attempt to invade Port Moresby from the sea, forcing Japan to try to take Port Moresby by land.Japan began its land offensive towards Port Moresby along the Kokoda Track on 21 July from Buna and Gona.