Editing Breen (section)

==Alliance with the Dominion==

In 2375, the Breen moved from a policy of low-level hostilities toward other major powers to one of open warfare when they allied themselves with the Dominion. They were then allowed access to the Dominion military database. According to the terms of the alliance, the Breen Confederacy received several planets in the Cardassian Union as compensation for joining the war. (DS9: "Strange Bedfellows")

:'''''The Breen may have been influenced to join the Dominion by a Changeling impersonator in the Confederacy's government, as an unidentified Breen was seen in Internment Camp 371, where several people who had been replaced by Changelings were placed.''''' 

Shortly after joining with the Dominion, the Breen attacked Starfleet Headquarters on Earth in the raid on San Francisco. A short time later they assisted Dominion forces in breaking the lines at Chin'toka. Under orders from the Female Changeling they allowed the escape pods to carry the Federation survivors to safety. This major battle, known as the Second Battle of Chin'toka, was won by the Dominion thanks to a unique Breen weapon, a form of energy dampening weapon system which could completely drain all the main power systems of a starship. Both of these defeats dealt a huge blow to the Allies' morale. The only ship immune to the Breen weapon was a Klingon Bird-of-Prey, which serendipitously survived thanks to an adjustment the chief engineer had made to the ship's tritium intermix in the warp core. (DS9: "The Changing Face of Evil", "When It Rains...")

Although the Klingon fleet was able to make the needed adjustments against the weapon, the Federation and the Romulans were still unable to defend against the Breen. When the Federation finally did create a defense against the energy-dampening weapon, they would force the Dominion fleet to retreat. Breen Thot Pran expressed an extreme distaste of surrender, and would require the reassurance of the female changeling that they were not surrendering, but were instead regrouping and attempting to redouble their shipbuilding and replenishment efforts. (DS9: "The Dogs of War")

With the necessary counter measures against the Breen's energy dampening weapon obtained, the Federation Alliance was able to go on the offensive once again, choosing to invade Cardassia Prime itself. In hopes of boosting the Breen's will to fight, the Female Changeling offered them control of Earth and Romulus if they succeeded in winning the battle. During the Battle of Cardassia, the Breen were still able to inflict major casualties on the allies, even without the use of their energy dampening weapon. Up to a third of the allies' entire fleet was destroyed during the battle, including the Romulan flag ship. The Breen continued to fight with the Dominion until the end, demonstrating a willingness to die for the cause that matched that of the Jem'Hadar. However, when the Cardassian forces switched sides mid-battle, the Dominion and Breen were forced to withdraw to Cardassia Prime. After Odo convinced the Female Changeling to surrender, the Dominion War ended. As allies of the Dominion, the Breen leaders were present during the signing of the Treaty of Bajor. (DS9: "What You Leave Behind")