8:00 am on December 7, 1941 Pearl Harbor was attacked. They were attacked by Japanese bombing planes.
The Japanese had caught the soldiers off guard. And the bombing last about two hours.
The bombing destroyed 8 battle ships, 20 american naval base, and more than 300 planes. They also killed 2000 soldiers and 1000 were wounded.
This was intended to destroy important american units. It was also to enable Japan to conquer southeast Asia without interference.
After the attack american joined the war. They had declared war on Japan.