The Imperial Fourth Attack Squadron was a squadron of the Imperial Navy considered a capital ship squadron. It consisted nearly entirely of Victory-class Star Destroyers. This particular squadron met its end at the Battle of Denab, which took place in the early stages of the Galactic Civil War, before the well-known Battle of Yavin. Rebel Alliance starfighters systematically destroyed the Star Destroyers, revealing the vulnerability of the Victory-class due to its sluggish sublight engines.