|Attack on Pearl Harbor|
|Approach and attack|
|Possible third wave|
In Europe, Nazi Germany and the Kingdom of Italy subsequently declared war on the United States immediately after they began operations against a fellow axis member, with Hitler stating in a delivered speech:
“The fact that the Japanese Government, which has been negotiating for years with this man [Franklin D. Roosevelt], has at last become tired of being mocked by him in such an unworthy way, fills us all, the German people, and all other decent people in the world, with deep satisfaction ... Germany and Italy have been finally compelled, in view of this, and in loyalty to the Tripartite Pact, to carry on the struggle against the U.S.A. and England jointly and side by side with Japan for the defense and thus for the maintenance of the liberty and independence of their nations and empires ... As a consequence of the further extension of President Roosevelt's policy, which is aimed at unrestricted world domination and dictatorship, the U.S.A. together with England have not hesitated from using any means to dispute the rights of the German, Italian and Japanese nations to the basis of their natural existence ... Not only because we are the ally of Japan, but also because Germany and Italy have enough insight and strength to comprehend that, in these historic times, the existence or non-existence of the nations, is being decided perhaps forever.”
Though the attack inflicted large-scale destruction on US vessels and aircraft, it did not affect Pearl Harbor's fuel storage, maintenance, and intelligence facilities.
The attack was an initial shock to all the Allies in the Pacific Theater. Further losses compounded the alarming setback. Three days later, the Prince of Wales and Repulse were sunk off the coast of Malaya, causing British Prime Minister Winston Churchill later to recollect "In all the war I never received a more direct shock. As I turned and twisted in bed the full horror of the news sank in upon me. There were no British or American capital ships in the Indian Ocean or the Pacific except the American survivors of Pearl Harbor who were hastening back to California. Over this vast expanse of waters Japan was supreme and we everywhere were weak and naked".
Fortunately for the United States, the American aircraft carriers were untouched by the Japanese attack, otherwise the Pacific Fleet's ability to conduct offensive operations would have been crippled for a year or so (given no diversions from the Atlantic Fleet). As it was, the elimination of the battleships left the U.S. Navy with no choice but rely on its aircraft carriers and submarines — the very weapons with which the U.S. Navy halted and eventually reversed the Japanese advance. Five of the eight battleships were repaired and returned to service, but their slow speed limited their deployment, serving mainly in shore bombardment roles. A major flaw of Japanese strategic thinking was a belief the ultimate Pacific battle would be fought by battleships, in keeping with the doctrine of Captain Alfred Mahan. As a result, Yamamoto (and his successors) hoarded battleships for a "decisive battle" that never happened.
Ultimately, targets not on Genda's list, such as the submarine base and the old headquarters building, proved more important than any battleship. It was submarines that immobilized the Imperial Japanese Navy's heavy ships and brought Japan's economy to a standstill by crippling the transportation of oil and raw materials. Also, the basement of the Old Administration Building was the home of the cryptanalytic unit which contributed significantly to the Midway ambush and the Submarine Force's success.
Admiral Hara Tadaichi summed up the Japanese result by saying, "We won a great tactical victory at Pearl Harbor and thereby lost the war."
While the attack accomplished its intended objective, it turned out to be largely unnecessary. Unbeknownst to Isoroku Yamamoto, who conceived the original plan, the U.S. Navy had decided as far back as 1935 to abandon 'charging' across the Pacific towards the Philippines in response to an outbreak of war (in keeping with the evolution of Plan Orange). The U.S. instead adopted "Plan Dog" in 1940, which emphasized keeping the Imperial Japanese Navy (IJN) out of the eastern Pacific and away from the shipping lanes to Australia while the U.S. concentrated on defeating Nazi Germany.
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