when was pearl harbor attack
1 The attack on Pearl Harbor occurred on December 7, 1941. 2  The Japanese attacked the United States without warning. 3  The attack lasted 110 minutes, from 7:55 a.m. until 9:45 a.m. 4  A total of 2,335 U.S. servicemen were killed and 1,143 were wounded. 5  Sixty-eight civilians were also killed and 35 were wounded.