Pearl Harbor Attack

On the morning of 7 December 1941, the Imperial Japanese Navy launched a surprise carrier-based air attack on the US Pacific Fleet anchorage at Pearl Harbor, on the island of Oʻahu, Hawaii. The strike force, commanded by Vice Admiral Chūichi Nagumo and operating under the overall plan of Admiral Isoroku Yamamoto, comprised six aircraft carriers (including Akagi, Kaga, Sōryū, Hiryū, Shōkaku, and Zuikaku) and launched two waves of aircraft totaling more than 350 planes.

The attack sank or damaged eight US battleships — most famously the USS Arizona, which exploded after a bomb detonated its forward magazine, and the USS Oklahoma, which capsized. Roughly 2,400 Americans were killed and over 1,100 wounded. Japan simultaneously struck US and British positions across the Pacific, including the Philippines, Guam, Wake Island, Hong Kong, and Malaya.

The raid was tactically successful but strategically incomplete: the fleet's aircraft carriers were at sea and survived, and the base's fuel depots and repair facilities were left largely intact. Crucially, Japan's declaration of war was delivered to US Secretary of State Cordell Hull after the bombing began, making the attack legally a surprise assault.

The next day, 8 December 1941, President Franklin D. Roosevelt addressed a joint session of Congress, calling 7 December "a date which will live in infamy," and Congress declared war on Japan with a single dissenting vote (Rep. Jeannette Rankin). On 11 December 1941, Nazi Germany and Italy declared war on the United States, bringing America fully into the global conflict.

In international-relations scholarship, Pearl Harbor is a standard case study in intelligence failure, strategic surprise, and the limits of deterrence. The 1946 Joint Congressional Committee investigation and later works by Roberta Wohlstetter (Pearl Harbor: Warning and Decision, 1962) examined how warning signals were lost in "noise."