In late 2375, the Breen became allies of the Dominion, where they committed a large fleet of ships to join the war effort. Worf and Ezri Dax were brought aboard a ship after being captured by the Breen on a planet in the Goralis system. (DS9: "Penumbra", "'Til Death Do Us Part")
The Federation first encountered the ships in combat during the Second Battle of Chin'toka. The Cardassian and Dominion ships held back while the Breen engaged and destroyed the Federation Alliance fleet and forced them from the Chin'toka system and losing the only enemy territory that they held in Cardassian space. (DS9: "The Changing Face of Evil")
Several Breen ships were destroyed by the Cardassian fleet when the Cardassians joined the Allies. Breen ships were also deployed in orbit of Cardassia Prime after the Dominion's retreat. (DS9: "The Changing Face of Evil", "The Dogs of War", "What You Leave Behind")
The primary weapon of the Breen ship were formidable torpedo weapons fired from at least three forward launchers at the pikes of the ship. One such ship destroyed Legate Damar's ship in orbit of Cardassia Prime. (DS9: "The Dogs of War")
Additionally, this class of ship was equipped with energy dissipaters which disabled enemy engines, weapons, and shields. (DS9: "The Changing Face of Evil") The Klingon Bird-of-Prey IKS Ki'tang was the only enemy not affected, leading to a defense being discovered. (DS9: "When It Rains...")
In 2375, both Worf and Ezri Dax held in a cell aboard Gor's ship, where they were fed algae paste for sustenance. According to Worf, their experience was "intolerable", as he was frustrated that "they have us caged up like animals!" (DS9: "Penumbra", "'Til Death Do Us Part")
Ships of the class
They were identified as little more than "Breen ships" in all related references and scripts, however, it would be reasonable to assume that the main war vessels used by the Breen during the war were indeed the same as the unseen but previously identified Breen warships previously referenced in "Indiscretion".
- "Designing the Breen ship", Ben Robinson, Star Trek: The Magazine Volume 1, Issue 7, pp. 48-52, November 1999
- Star Trek: The Official Starships Collection, issue 69, March 2016
Breen warships appear in Star Trek Online as a part of the game's "Season Two" update. They are referred to as the Chel Grett class, a name that also appears in the Fires of Armageddon sourcebook. A playable version of this vessel was released as part of the 2012 winter event. For the 2016 one, an upgraded version named Chel Boalg was made.