194: Pearl Harbor: December 7, 1941

Key Takeaways

An Oahu radar station detected incoming Japanese aircraft on December 7, 1941, but the warning was mistakenly dismissed.
Japan meticulously planned a surprise attack on Pearl Harbor, aiming to cripple the US Pacific Fleet.
The attack involved two waves, resulting in catastrophic damage to Battleship Row and destruction of hundreds of US aircraft.
President Roosevelt recognized the attack as the end of American isolationism, immediately preparing for a declaration of war.
The Pearl Harbor offensive was part of a wider, simultaneous Japanese military campaign across the Pacific.

Two Army privates detected a large aircraft formation at 7:02 a.m. on December 7, 1941, approaching Oahu from the north.
Lieutenant Kermit A. Tyler, the watch officer, dismissed the radar sighting, believing them to be friendly B-17s arriving from California.

Escalating tensions between Japan and the U.S. in the 1930s, fueled by Japan's expansionism and US trade restrictions, led to Japan feeling cornered.
Admiral Yamamoto Isoroku began planning a surprise attack on Pearl Harbor by April 1941 to cripple the American Pacific Fleet, which was deemed feasible.
Combined Fleet Top Secret Operation Order No. 2, issued November 7, 1941, solidified December 7, 1941 (US time) as the attack date.

At 7:55 a.m. on Sunday, December 7, 1941, Japanese torpedo bombers initiated the attack on Battleship Row, catching many sailors off guard.
The USS Oklahoma was hit by torpedoes at 7:56 a.m., losing power instantly, and Mess attendant Doris Miller assisted his mortally wounded captain on the USS West Virginia.
A bomb struck the USS Arizona near turret number two, causing a massive explosion, leading to its sinking by 8:06 a.m. with 1,177 lives lost.

The USS Arizona alone accounted for 1,177 casualties, nearly half of the day's total deaths, with approximately 900 remaining entombed within.
By 8:08 AM, the USS Oklahoma capsized with 429 deaths, and other ships like the USS California and USS West Virginia were also hit.
By the end of the first wave around 9 AM, U.S. aircraft on Oahu were largely destroyed, with Japan losing only 9 planes.

At 1:40 PM Eastern Time on December 7, 1941, President Franklin D. Roosevelt received confirmation of the Japanese attack, recognizing the end of American isolationism.
Roosevelt instructed Secretary of State Cordell Hull to proceed with a planned meeting with the Japanese ambassador but reveal nothing of the attack.
At 3 PM D.C. time, Roosevelt convened his war cabinet, and informed British Prime Minister Winston Churchill of his intention to ask Congress for a declaration of war.

A second wave of 171 Japanese aircraft attacked Pearl Harbor, targeting battleships, airfields, and infrastructure, killing 49 civilians.
Lieutenant Phil Rasmussen, flying a Curtis P-36, described engaging in chaotic dogfighting with Japanese Zeros and surviving severe damage to his aircraft.
Upon returning to Wheeler Field, Lt. Rasmussen observed ongoing fires, exploding ammunition, and destroyed P-40s, indicating the widespread nature of the Japanese attack.

In the aftermath, Pearl Harbor was covered in thick smoke from burning ships and oil slicks on the water, initiating immediate firefighting and salvage operations.
The attack resulted in four battleships sunk, four severely damaged, and approximately 300 aircraft destroyed across Oahu's airfields.
Total casualties reached 2,403 deaths (2,335 military, 68 civilian) and nearly 1,200 injured, but the survival of the three US aircraft carriers proved critical.

Simultaneously with Pearl Harbor, Japan launched additional strikes across the Pacific, targeting Wake Island, Malaya, Hong Kong, and the Philippines.
In the Philippines, despite early warnings at 4 a.m. on December 8th, American planes at Clark Field were caught on the ground by a Japanese attack at 12:13 p.m.
The attack on Clark Field destroyed half of the Philippines' air defenses, leading General MacArthur to state the Philippine Air Arm 'died with our battleships.'

On the morning of December 8th, President Franklin Roosevelt refined his address to Congress, incorporating new information about attacks on Guam, the Philippines, Wake Island, and Midway.
Before a crowded House chamber, Roosevelt famously declared, 'Yesterday, December 7th, 1941, a date which will live in infamy,' detailing Japan's surprise attack.
He informed Congress that Japan had engaged in peace talks while simultaneously planning the attack and formally requested a declaration of war, effective December 7, 1941.