Gang War (released as All Square in the UK) is a 1928 American part-talking gangster film, best known for being the main feature attached to Steamboat Willie, the debut of Mickey Mouse in sound. 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. The film was released with talking sequences, as well as a musical score and sound effects for the silent sections. But despite the synchronised sound as well as the all-star cast, the film is largely unknown in its own right and is now a lost film, being overshadowed by its far more famous preceding short.