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:
Pacific War series
Shortly before 3pm local time, the third wave arrives over Pearl Harbor. This time, the defences are on alert, putting up a dense anti-aircraft barrage which inflicts severe losses, the strike force losing a third of its aircraft. But the attackers cause heavy damage nonetheless, destroying No 1 dry-dock, the oil tank farms and the headquarters of the Pacific Fleet, killing the Commander-in-Chief Admiral Kimmel. In addition, a number of ships left intact after the earlier attacks are sunk or damaged, including all of the submarines still moored in the harbor. Fuchida, his aircraft badly damaged, barely makes it back to his carrier. 
The novel ends with Admiral Yamamoto grimly resolved to remain in Hawaiian waters until the battle is brought to a decisive conclusion and Admiral Halsey on board the USS "Enterprise", less than a day’s sail from Pearl Hearbor, mounting a search for the enemy fleet that he has vowed vengeance upon.