This is what we found on Wikipedia regarding the Tora:

Tora! Tora! Tora! (Japanese: トラ・トラ・トラ！) is a 1970 epic war film that dramatizes the events leading up to the Japanese attack on Pearl Harbor in 1941, from both American and Japanese positions. The film was produced by Elmo Williams and directed by Richard Fleischer, Toshio Masuda and Kinji Fukasaku. It features an ensemble cast, including Martin Balsam, Joseph Cotten, So Yamamura, E.G. Marshall, James Whitmore, Tatsuya Mihashi, Takahiro Tamura, Wesley Addy, and Jason Robards. It was Masuda and Fukasaku's first English-language film, and first international co-production.

The tora of the title, although literally meaning "tiger", is actually an abbreviation of a two-syllable codeword (i.e., totsugeki raigeki 突撃雷撃, "lightning attack"), used to indicate that complete surprise had been achieved.

The film was released in the United States by Twentieth Century Fox on September 23, 1970, and in Japan by the Toei Company on September 25. It received mixed reviews from American critics, but was praised for its historical accuracy and attention to detail, its visual effects, and its action sequences. Tora! Tora! Tora! was nominated for five Oscars at the 43rd Academy Awards, including Best Cinematography and Best Film Editing, winning Best Visual Effects (L.B. Abbott and A.D. Flowers). The National Board of Review ranked it in its Top Ten Films of 1971. A 1994 survey at the USS Arizona Memorial determined that for Americans the film was the most common source of popular knowledge about the Pearl Harbor attack.