It seems that fate was on the side of the Japanese. At 6:30 a.m. on 7 December a small Japanese submarine entered a prohibited area off Oahu and was sunk by destroyers and aircraft. The naval watch-officer was informed and, in his turn, informed the Chiefs-of-Staff at Pearl Harbor; but for some reason no general alert was given. More extraordinary still, it is a fact that at 7:00 a.m. the operator of a provisional detector station out in the Pacific belonging to the American Army

　　reported a large flight of airplanes about 210 kilometers from Oahu to the east-north-east. An army lieutenant decided that the airplanes must obviously be friendly ones and took on action. An unusually cloudy sky added to Japanese luck. A routine dawn patrol of American aircraft had passed over Oahu and reported nothing.

　　At 7:50 a.m. on that Sunday morning a great noise of approaching aircraft attacked the ships in the harbor and the naval installations; high-level bombers bombed the airfields and also Honolulu some 11 kilometers away. The attacks were followed by fighter planes firing machine-guns with incendiary bullets, particularly at the planes on the airfield; some pocket submarines attacked the harbor at the same time.

　　Just as there had been no adequate air or sea patrols, so inside Pearl Harbor no precautions against attack had been taken; warships were moored close one against another and a larger proportion of officers and ratings were on leave and many sleeping ashore. A similar peace-time carelessness pervaded the Hickham army airfield close to Pearl Harbor and other aerodromes on the island. Before the last attack, which was made at 9:00 a.m. and which met with heavy anti-aircraft and naval gun-fire, the Japanese were able to strafe their objectives almost without resistance and the aircraft were able to return to their carriers to refuel and to return to the attack.

　　Of the eight battleships, the Arizona, California and Utah, a target ship, were sunk outright; the Oklahoma capsized shortly after being bombed; the Nevada was set on fire and put out of action for many months; the three others were more or less seriously damaged. Considerable additional damages were done to ships, a minelayer was sunk, three cruisers damaged, two destroyers sunk and another damaged. Some 2,300 officers and men were killed and some hundreds of the nearly two thousand wounded died later. The Japanese are said to have lost 60 aircraft, whilst the Americans had 173 destroyed and over 100 damaged.

 来源：外语教育网