The Attack on Pearl Harbor was launched by the 1st Air Fleet of the Imperial Japanese Navy on Sunday, December 7, 1941. It was aimed at the Pacific Fleet of the United States Navy and its defending Army Air Corps and Marine defensive squadrons as preemptive war intended to neutralize the American forces in the Pacific in an impending World War II. Pearl Harbor was actually only one of several military and naval installations which were attacked, including those on the other side of the island.
Of eight American battleships in the harbor, the attack resulted in 1 destroyed, 2 sunk at their moorings, 1 capsized, 1 beached and 3 damaged but afloat. With the exception of the Arizona (destroyed), and the Utah (sunk, and intentionally not salvaged, as she had been retired and converted into a floating target), all the others were refloated or righted and 6 (Nevada, West Virginia, Tennessee, Maryland, California and Pennsylvania) were repaired and returned to service. While the Oklahoma, which had capsized, was righted, she was never repaired. Additionally, the attack severely damaged 9 other warships, destroyed 188 aircraft, and killed 2,403 Americans: 2,335 servicemen and 68 civilians. However, the Pacific Fleet's three aircraft carriers were not in port and were left undamaged, as were the base's vital oil tank farms, Navy Yard and machine shops, submarine base, and power station, as well as the Headquarters Building (home to the intelligence unit HYPO). These provided the basis for the Pacific Fleet's campaign during the rest of the war.
Source - Wikipedia
