At the beginnning of World War II, the Imperial Navy had created the finest naval aviation corps in the world. Japanese aircraft were at least the equals of anything then flying in the West, and in some cases (as with the legendary Zero Fighter) were substantially better. Japanese aircrews were superbly trained and had been battle tested in the conflice in China during the late 1920's. When war tore across the Pacific in December 1941, the IJNAF was more than a match for any of its opponents. It is not surprising, then, that Japanese aviators scored victory after stunning victory during the first six months of the war, from the attack on Pearl Harbor, through the sinking of the British men-of-war Prince of Wales and Repulse, to the fearsome raids on northern Australia and the IJN's rampage through the Indian Ocean in April 1942. Only after the defeat at Coral Sea and the debacle at Midway was thir force finally able to be engaged on nearly equal terms.