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How did japan know when to attack pearl harbor?

Updated: 8/16/2019
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Naval Intelligence.

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Q: How did japan know when to attack pearl harbor?
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How did the Japanese know where to attack Pearl Harbor?

japan knew where to attack Pearl Harbor because due to recent research the japanses knew where and when the would attack.


Did the Americans know Japan was planning to attack Pearl Harbor?

it was an unexpected suprise attack


Did America know japan was going to attack pearl harbor?

There are books written that state that the US did know.


What wa the Attack on Pearl Harbor?

the attack of pearl harbor was whaen japan bombed a us nava base causing aamerica to get involved into the horrendous war know as world war two.


How did the US know the Japanese were going to attack Pearl Harbor?

They intercepted a mesage from Japan to its naval fleet.


How did the Japan know when to attack Pearl Harbor?

Japan sent men posing as tourists to Hawaii who took photos and took notes on the activities in and around Pearl Harbor over the course of a couple years.


Why did Germany attack Pearl Harbor?

Pretty sure Pearl harbor was attacked by the Japanese in 1947 to prevent the US from influencing the war in south Asia that Japan was planning... unless you know of another attack to specify on?


Did Hitler sanction Pearl Harbor attack by japan?

No. From what I know, Adolf Hitler did not have anything to do with Pearl Harbor except for the fact that he is one of the causes of World War II which then caused the Japanese to attack us with a long history behind it. Did_Hitler_have_anything_to_do_with_the_attack_at_Pearl_Harbor


What else did japan do almost at the same of the pearl harbor attack?

At the same time during the pearl harbor attack, there was a nuclear radiation, a tsunami and an earthquake. Also that albert einstien invented an atomic bomb. the russains bombed it to Japan and it killed hundreds of people in japan. A japanese guy (i do not know this guy's name) who survived 2 nuclear attacks in japan.


Did the president know that japan was going to attack pearl harbor?

yes,they had some resources that the U.S. was going to be attacked,but they didnt know who,so 50/50


On Pearl Harbor did the US ever undo the code?

Yes, the code was already broken right before the attack on Pearl Harbor even started. President Roosevelt already knew about the Japanese was going to attack Pearl Harbor, but he didn't know for sure if it was true. Yes, the code was already broken right before the attack on Pearl Harbor even started. President Roosevelt already knew about the Japanese was going to attack Pearl Harbor, but he didn't know for sure if it was true.


Why were so many ships in pearl harbor?

The origins of the tension between the US and Japan, which ultimately led to the attack on Pearl Harbor, dates back to the early part of the 20th Century. In summary: In response to Japan's declaration of war on China, which occurred in 1937, and then in 1940, further advancing their troops into northern Indo-China, the US demanded that Japan withdraw from China. Japan refused the demands of the US. In July, 1941 after Japan had refused to withdraw from China, the US, (who supplied Japan with approximately 80% its oil resources, and many of the country's other resources) imposed a complete oil embargo on Japan. This decision, and event is what triggered Japan to attack Pearl Harbor. The reason Pearl Harbor was chosen, as point of target, was, in May of 1940, the US Navy had moved its US Fleet headquarters from San Pedro, California, to Pearl Harbor, Hawaii. Ironically, the move was a planned one on President Roosevelt's part, to counter Japan's increasing maneuvers and presence in the South Pacific. This decision, and the United States' under estimation of the ability of Japan's military to successfully attack the Navy's fleet at Pearl Harbor, was critical to Japan's successful plan and attack.