In December 1968, the three-year script for the film was approved by the governments of Japan and the United States. Filming also started in December. The film was co-produced by the United States and Japan. The two sides of the war came together to make a film, and the director was also a director from each. The purpose of preparing the film at that time was to present the history of the Japanese Army’s Attack on Pearl Harbor.
Three weeks after the start of filming, the team led by Akira Kurosawa lags behind the producer’s plan. Due to the pressure of the film’s progress and budget, Fox employs Fukasaku Kinji and Masuda Toshio as assistant directors, Fukasaku Kinji In charge of the action scenes, Masuda Toshio is in charge of the literary drama, and the general saying for this replacement is that Akira Kurosawa is sick. Although the filming work of the film was affirmed by Fox executives, some big bang scenes were not completed as expected by the director because of accidents. "Tora! Tora! Tora!" was finalized in June 1969, about a week earlier than expected
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