Operation Return

Operation Return was an engagement during the Dominion War, where Federation Alliance launched an assault against Dominion and Cardassian forces in the Bajor sector in 2374. The main objective of the assault was to recapture Deep Space 9 and stop Dominion forces from taking down the minefield that blocked the entrance to the Bajoran wormhole. Deep Space 9 was eventually recaptured by the Alliance, and became one of the major turning points of the war. (DS9 episodes: "Favor the Bold" & "Sacrifice of Angels").