Changes

Nagumo's fleet assembled in the remote anchorage of Tankan Bay in the [[Kurile Islands]] and departed in strictest secrecy for Hawaii on November 26, 1941. The ships' route crossed the North Pacific and avoided normal shipping lanes. At dawn on December 7, 1941, the Japanese task force had approached undetected to a point slightly more than 200 miles north of Oahu. At this time the U.S. carriers were not at Pearl Harbor; on November 28, Admiral Kimmel sent USS ''Enterprise'' under Rear Admiral William Halsey to deliver Marine Corps fighter planes to [[Wake Island]]. On December 4 ''Enterprise'' delivered the aircraft and on December 7 the task force was on its way back to Pearl Harbor. On December 5, Admiral Kimmel sent the USS ''Lexington'' with a task force under Rear Admiral Newton to deliver 25 scout bombers to [[Midway Island]]. The last Pacific carrier, USS ''Saratoga'', had left Pearl Harbor for upkeep and repairs on the West Coast.

Nagumo's fleet assembled in the remote anchorage of Tankan Bay in the [[Kurile Islands]] and departed in strictest secrecy for Hawaii on November 26, 1941. The ships' route crossed the North Pacific and avoided normal shipping lanes. At dawn on December 7, 1941, the Japanese task force had approached undetected to a point slightly more than 200 miles north of Oahu. At this time the U.S. carriers were not at Pearl Harbor; on November 28, Admiral Kimmel sent USS ''Enterprise'' under Rear Admiral William Halsey to deliver Marine Corps fighter planes to [[Wake Island]]. On December 4 ''Enterprise'' delivered the aircraft and on December 7 the task force was on its way back to Pearl Harbor. On December 5, Admiral Kimmel sent the USS ''Lexington'' with a task force under Rear Admiral Newton to deliver 25 scout bombers to [[Midway Island]]. The last Pacific carrier, USS ''Saratoga'', had left Pearl Harbor for upkeep and repairs on the West Coast.

==The attack==

==The attack==

At 6:00 a.m. on December 7, the six Japanese carriers launched a first wave of 181 planes composed of torpedo bombers, [[Aichi D3A|dive bombers]], horizontal bombers and [[Mitsubishi Zero|fighters]]. Even as they winged south, some elements of U.S. forces on Oahu realized there was something different about this Sunday morning.

At 6:00 a.m. on December 7, the six Japanese carriers launched a first wave of 181 planes composed of [[Nakajima B5N|torpedo bombers]], [[Aichi D3A|dive bombers]], horizontal bombers and [[Mitsubishi Zero|fighters]]. Even as they winged south, some elements of U.S. forces on Oahu realized there was something different about this Sunday morning.

In the hours before dawn, U.S. Navy vessels spotted an unidentified submarine periscope near the entrance to Pearl Harbor. It was attacked and reported sunk by the destroyer USS ''Ward'' (DD-139) and a patrol plane. At 0700, an alert operator of an Army radar station at Opana spotted the approaching first wave of the attack force. The officers to whom those reports were relayed did not consider them significant enough to take action. The report of the submarine sinking was handled routinely, and the radar sighting was passed off as an approaching group of American planes due to arrive that morning.

In the hours before dawn, U.S. Navy vessels spotted an unidentified submarine periscope near the entrance to Pearl Harbor. It was attacked and reported sunk by the destroyer USS ''Ward'' (DD-139) and a patrol plane. At 0700, an alert operator of an Army radar station at Opana spotted the approaching first wave of the attack force. The officers to whom those reports were relayed did not consider them significant enough to take action. The report of the submarine sinking was handled routinely, and the radar sighting was passed off as an approaching group of American planes due to arrive that morning.