Gang War (released as All Square in the UK) is a 1928 American sound part-talkie gangster film directed by Bert Glennon, best known for being the main feature attached to Steamboat Willie, the debut of Mickey Mouse in sound. In addition to sequences with audible dialogue or talking sequences, the film features a synchronized musical score and sound effects along with English intertitles. The soundtrack was recorded using the RCA Photophone sound-on-film system. Despite the synchronised sound as well as the all-star cast, the film is largely unknown in its own right. One reel of an original 35mm positive print of nitrate film survives at the BFI film archive. The rest of the film appears to be lost. The film has been overshadowed by its far more famous preceding short, Steamboat Willie. The film starred Jack Pickford in his last major role as "Clyde", a saxophone player whose love for a dancer named Flowers (Olive Borden) traps him in the middle of a gang war.