Damage The surprise attack lasted less than two hours.During that time,2,403 Americans were killed,1,178 were wounded,20 warships were sunk or severely damaged, and approximately 150 airplanes were destroyed.By chance,three American aircraft carriers were out at sea and escaped the calamity.Damage • The surprise attack lasted less than two hours. During that time, 2,403 Americans were killed, 1,178 were wounded, 20 warships were sunk or severely damaged, and approximately 150 airplanes were destroyed. By chance, three American aircraft carriers were out at sea and escaped the calamity