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''[[United Federation of Planets|Federation]], [[Klingon Empire]] and [[Romulan Star Empire]] vs. [[Dominion|The Dominion]], [[Cardassian Union]] and [[Breen Confederacy|The Breen Confederacy]]''   The '''Second Battle of Chin'toka''' in [[2375]] marked the entry of the [[Breen Confederacy]] into the [[Dominion War]] . This culminated in late-2375 in an a second attack against the [[Chin'toka system]], a territory of the [[Cardassian Union]] currently held by the allied forces of the [[Federation]], the [[Klingon Empire]], and the [[Romulan Star Empire]]. In terms of ships destroyed to ships engaged, it It was considered the worst tactical defeat for of the Allies throughout the entire war; , with 99.6% of the fleet was destroyed in the this battle. It However, it was also the last major Dominion victory of the war. 

Although Though the Federation had previous contact with the [[Breen]] for at least the previous decade, very little solid information was known about them. Isolated Xenophobic and physically isolated behind their full-body [[refrigeration suit]]s, they the Breen as a species remained shrouded in mystery, a mystery that was only enhanced by their isolationist policies. As a result, the [[United Federation of Planets|Federation ]] and its allies considered the Breen to be little more than a minor regional power.

In the second half of [[2375]], the [[Dominion]] was faced with the prospect of their war in the [[Alpha Quadrant]] dragging on for several more years. Their original plans had projected their invasion of the Federation and the [[Klingon Empire]] to take six months at most. Known only as a [https://memory-alpha.fandom.com/wiki/Founder Founder] or the [https://memory-alpha.fandom.com/wiki/Female_Changeling Female Changeling], the Leader of the Dominion was suffering degenerative effects of the [[morphogenic virus]], and so sought additional allies in order to increase the Dominion's numbers, to bring a quicker end to the conflict. After initial contact between the [[Breen]] and the [[Founders]], the Breen eagerly agreed to join the war and support the Dominion.  Within days, the Breen launched a massive offensive against the Federation and its territories. Most Perhaps the most damaging in terms of destruction and morale was a bold an attack against [[Starfleet Star Fleet Headquarters]] on [[Earth]] – . This marked the first time that open combat had taken place on Earth in over 200 years.   After the [[First Battle of Chin'toka]], the system was the only foothold the allies had in Dominion territory. Even so, [[Jem'Hadar]] forces for the Dominion were constantly attacking the Alliance's positions, and its hold on the system was growing weaker by the day. The [[Dominion]] and their allies decided to re-take the system using a combined attack from Jen'Hadar, Breen, and Cardassian forces. With most of their forces engaged with the [[Romulan|Romulans]], the [[Founders]] were forced to rely on technology from their newest addition, the [[Breen]].

With the addition of [[Romulan |Romulans]] bringing additional forces, the counter-offensive was initially blunted as allies were able to launch a defense against the Dominion forces launched their 's second attackagainst Chin'toka. However, the Dominion forces managed was able to break through and flank the Allied lines in two placesallies, outflanking allied negating their defenses. The Dominion fleet re-took the planets in the system, as and the allied fleet fleets retreated and withdrew. As the [[Jem'Hadar]], [[Cardassian]], and [[Breen ]] ships consolidated their position, Starfleet and its allies rallied firmed their starships for a counterattack to drive the enemy fleet from the systempositions, under the command of [[General]] [https://memory-alpha.fandom.com/wiki/Martok Martok] of the [[Klingon Defense Force]]srallied for a counterattack to drive the enemy from the system.  312 allied warships rallied to take on the enemy fleet, with all available reinforcements coming from outside the system, even as far as Bajor (45 lightyears away). With no battle plan, leaving reserve forces on the edge of the system, the Allies resolved to destroy the enemy fleet with brute force. The Jem'Hadar and Cardassian warships held back, giving their new Breen allies a chance to prove themselves as worthy combatants.  

The allied ships were pushed back to When the edge of the systemAllied Fleet opened fire, as 312 allied destroying several Breen warships were rallied to take on , the enemy fleetBreen attack wing retaliated by firing a volley of a new kind of energy weapon. Never seen before, with this weapon completely disabled all available reinforcements coming in from outside of the system, even as far as BajorAllies' primary systems. The Allied fleet had no discernible battle plan; leaving a reserve force on warships now adrift and free targets for the edge of Breen ships, the systemBreen switched to conventional weapons, they resolved to destroy and targeted the enemy fleet adrift targets with brute forcetheir torpedoes. The Jem'Hadar and Cardassian warships held entire allied fleet left totally vulnerable, unable to take evasive action or fire back, giving fell as ship after ship exploded or was rendered uninhabitable after volleys of destructive torpedo fire. Unable to retaliate, the survivors of the heavily damaged allied ships launched their new [[Escape Pods|escape pods]] in a desperate bid to survive. The Dominion leadership allowed the pods to escape, under the justification that the survivors would spread fear through the Alliance with tales of the destruction during the battle. The Breen allies a chance warships proceeded to prove themselves as worthy combatantsdestroy the crippled allied ships and re-took the system.

The Breen Allied escape pods were picked up by emergency rescue ships switched to conventional weapons, and targeted dispatched from the adrift targets with their torpedoes. The entire allied fleet was totally vulnerable, unable to take evasive action or to fire reserve force held back. Ship after ship exploded or was rendered uninhabitable after volleys of destructive torpedo fire. Unable to retaliate, the survivors onboard the heavily damaged allied ships launched their [[escape pod]]s in a desperate bid to escape the carnage. The Dominion leadership allowed the pods to escape, under the justification that at the survivors would spread fear through the Alliance about tales edge of the destruction of the battlesystem. The Breen warships proceeded Allies quickly retreated to destroy the crippled allied ships and reFederation-took the systemheld space.

The Second Battle of Chin'toka was arguably the worst defeat suffered by the Allies throughout the war. In terms of starships lost to ships engaged, it was the worst defeat since the Federation's reversal in the Tyra system, where 98 ships were destroyed out of 112. The battle ended all allied Allied offensives against the Dominion for the next month, while allied Allied engineers scrambled to develop a countermeasureany sort of defense against the Breen weaponry. The [[https://memory-alpha.fandom.com/wiki/IKS_Ki%27tang IKS Ki'tang|IKS ''Ki'tang'']], a [[Klingon Bird-of-Prey]], was the only allied ship impervious to unaffected by the Breen's energy dampening weapons, thanks to a chance modification made by its chief engineer.   The entire Klingon fleet made the same adjustments, making them the only Allied ships invulnerable to the Breen's weapons. However, the Federation and Romulan fleets were unable to adjust their engines as such, leading to them being temporarily withdrawn from the front lines of the war. General Martok brought 1,500 Klingon ships to the front to fight the war while the other Allies worked on their defenses. Unfortunately, the Klingon ships were against no less than 30,000 Jem'Hadar, Cardassian and Breen warships, outnumbering them twenty to one.

However, the allied fleets were bought precious time to develop a countermeasure when When [[Legate]] {{MA|[https://memory-alpha.fandom.com/wiki/Damar|Damar}}, ] led a Cardassian rebellion against the [[Cardassian RebellionDominion]] in its first assault on , he unintentionally brought the Allied forces enough time to develop defenses against the Dominion's [[Vorta]] cloning center on [[Rondac III]]Breen. The Dominion re-focused its offensive energies to energy into defeating the this rebellion, costing which cost them the an opportunity of launching to launch a massive unstoppable offensive offense into Allied territory. This bought the allies enough time to develop a countermeasure with help from Damar's resistance, however the primary cells of the rebellion were annihilated when the Dominion destroyed 18 Cardassian Rebellion bases. The Allied fleets, now negating that the Dominion's only advantage the Dominion hadwas gone, organized their forces for a single, destructive blow to the Dominion at the [[https://memory-alpha.fandom.com/wiki/Battle_of_Cardassia Battle of Cardassia]], two months later.