The Battle of Deep Space 9 may refer to the following four engagements: * First Battle of Deep Space 9, fought in 2372, beginning the Second Federation-Klingon War * Battle of Terok Nor, fought in 2372 between the Terran Resistance Forces the Klingon-Cardassian Alliance * Second Battle of Deep Space 9, fought in 2373, beginning the Dominion War * Operation Return, the code name for the Federation Alliance effort to reclaimed Deep Space 9 in 2374 de:Schlacht um Deep Space 9