Mighty Mouse and the Kilkenny Cats (1945)

Mighty Mouse" cartoon. Cat and gang are ousted by Mighty Mouse. The mice in a big city are being ravaged by a vicious gang of cats led by notorious gang leader Kilkenny. The mice create assembled military units (tanks and planes and infantry... it's World War II, after all) to take on the cats... but they fail, and Mighty Mouse must rescue them! What? You were expecting they could win without him?