Dominion War

The Dominion War was a conflict fought between 2373 and 2375. The Dominion was a major political power in the Gamma Quadrant, who allied with the Cardassian Union (and later, the Breen) in an effort to "bring order" to the Alpha Quadrant. The Federation and the Klingon Empire, along with the Romulan Star Empire, formed an alliance to repel these forces.

Prelude
The massive Dominion buildup in Cardassian space began in mid-2373. Within a few weeks, the Jem'Hadar had forced the Klingons out of Cardassian space and eliminated the Maquis. 

The Federation's Deep Space 9 space station located in the Bajor sector served as a major staging point for many battles during the war.

Open War

 * Also see: The Dominion War Timeline

Aftermath
Both sides suffered heavy loses in the war. Following the conflict the Federation's resources were spread thin not just in reconstruction of member worlds but also in adding independent worlds affected by the war (seeking new allies and members in the process) and even aiding enemy worlds from the war, providing substantial assistance to help Cardassia recover from the final attacks from the Dominion. (DS9 novel: Avatar)

List of Conflicts
The dominion War spread throughout much of the Alpha and Beta Quadrants and included numerous battles, these included:
 * Second Battle of Deep Space 9 (2373)
 * Battle of Torros III (2373)
 * Operation Return (2374)
 * First Battle of Chin'toka (2374)
 * Raid on Trelka V (2375)
 * Invasion of Septimus III (2375)
 * Second Battle of Chin'toka (2375)
 * Attack on Avenal VII (2375)
 * Battle of Rashanar
 * Battle of Cardassia (2375)

Appendices
In the span of the Dominion War numerous stories take place in the Star Trek universe, some dealing specifcally with the war include:
 * TNG novel: The Battle of Betazed
 * The Dominion War miniseries:
 * TNG novel: Behind Enemy Lines
 * DS9 novelization: Call to Arms...
 * TNG novel: Tunnel Through the Stars
 * DS9 novelization: ...Sacrifice of Angels
 * TNG comic: The Gorn Crisis
 * DS9 anthology: Prophecy and Change
 * Multi-series anthology: Tales of the Dominion War
 * SCE eBook: War Stories''