The Dominion War was an interstellar conflict which raged across the Alpha Quadrant from 2373 until 2375. Here is a timeline of those events.
2373
- Stardate 50564.2: A large fleet of Jem'Hadar warships enter the Alpha Quadrant via the Bajoran wormhole and Starfleet fears that an attack on Deep Space 9 is imminent. Major Kira Nerys leads the USS Defiant along with Gul Skrain Dukat's Klingon bird-of-prey against the fleet. As the fleet turns away from Deep Space 9, Dukat joins them and informs Major Kira that Cardassia has joined the Dominion.
- Soon after a large Klingon and Romulan fleet rendezvous with the Federation fleet at DS9 in preparation for the joint Cardassian-Dominion fleet. However, it was later revealed that a Changeling had assumed the identity of Doctor Julian Bashir and an attempt to destroy the Bajoran sun is halted. (DS9 episode: "By Inferno's Light")
- As the threat of war with the Dominion increases several races including the Romulans, Tholians, and Miradorn all sign non-aggression pacts with the Dominion. On the eve of the war, Bajor also signs a non-aggression treaty at the behest of Captain Sisko. (DS9 episode: "Call to Arms")
- The Apocryphal RPG "The Dominion War Sourcebook: The Fires of Armageddon" states that the Gorn also signed a non-aggression pact with the Dominion.
- Stardate 50975.2: Following the arrival of a fifth convoy of Dominion ships entering the Alpha Quadrant, Starfleet orders Captain Sisko to begin plans to mine the entrance to the wormhole to stop any more Dominion reinforcements. DS9's engineering teams eventually develop self-replicating mines with each mine creating a replacement if one was destroyed.
- Weyoun is despatched to DS9 to arrange an agreement with Captain Sisko, but it is only a stalling measure as a large Dominion fleet is detected heading for the station. With Starfleet planning an assault on the shipyards on Torros III, Sisko is left to defend the station with the Defiant and the IKS Rotarran. Once the fleet arrives, DS9 buys time for the Defiant so that all of the mines could be laid. Once this is achieved all Starfleet personnel are evacuated from the station. Shortly after, Dukat assumes command once again and renames the station, Terok Nor. (DS9 episode: "Call to Arms")