Those who had decoded and seen the Japanese communications in early December 1941 would not be surprised when they heard about an attack on December 7, 1941. They would, however, be astonished when they heard where that attack took place. Posted on the other side of the world, it was early on the morning of December 8 in the Philippines when American general Douglas MacArthur received news of the Japanese attack on Pearl Harbor hours earlier. With that, it could only be a matter of time before the Japanese attacked the Philippines.
While the Battle of the Coral Sea is not as well known as other battles across the Pacific, it set a precedent by pitting enemy aircraft carriers against each other, a battle in which the rival navies themselves never sighted each other or fired a gun at each other. Instead, the fighting was done with the carriers' aircraft, something that would become more common over time and would result in decisive actions at places like Midway just months later. Furthermore, while it was in a sense a tactical victory for the Japanese, it would end up helping blunt their aggressive push east in the Pacific, making it a crucial strategic victory for the Allies.
By the time the Battle of Midway was over, the defeat was so devastating that it was actually kept secret from all but the highest echelons of the Japanese government. Along with the loss of hundreds of aircraft and over 3,000 men killed, the four Japanese aircraft carriers lost, when compared to America's one lost carrier, was critical considering America's huge shipbuilding superiority. However, the Battle of Midway could also have easily turned out differently. Japan began the battle with more carriers, more and better aircraft, and more experienced crews than the Americans, and if the battle of the Coral Sea was any indication, the two sides had irrefutable proof of the dominance of the aircraft carrier in the Pacific.
