Japanese war crimes
The U.S. officially classified all 3,649 military and civilian casualties and destruction of military property at Pearl Harbor as non-combatants as there was no state of war between the U.S. and Japan when the attack occurred. Joseph B. Keenan, the chief prosecutor in the Tokyo Trials, says that the attack on Pearl Harbor not only happened without a declaration of war but was also a treacherous and deceitful act. In fact, Japan and the U.S. were still negotiating for a possible peace agreement which kept U.S. officials very distracted when Japanese planes bombed Pearl Harbor. Keenan explained the definition of a war of aggression and the criminality of the attack on Pearl Harbor:
Minoru Genda
The surprise attack on Pearl Harbor resulted in the US declaring war on Japan, with 18 American warships sunk or damaged and over 180 American aircraft destroyed. The main Japanese fleet suffered no ship losses and 29 aircraft lost (9 in the first wave and 20 in the second), losses that the Japanese considered acceptable. But this surprise attack eventually led to disaster for Japan. In the four months after the attack, the Imperial Japanese carrier units ranged across the Pacific and Indian oceans causing major damage to Allied forces and bases. Genda and Yamamoto were very disappointed that the three U.S. carriers were not at Pearl Harbor (the first time on a Sunday in 1941 that they were not). Later, the Doolittle Raid brought this phase of the Pacific War to an end, as Japan was bombed for first time. The Pacific War continued on for three more years.