During the first few months of the war, the Federation and Klingon forces were suffering staggering defeats consistently. With the Dominion pushing deeper into Federation territory, the Seventh Fleet was dispatched to the Tyra system in an attempt to prevent the Dominion from moving further into their space.
Comprised of 112 vessels, the Federation was confident the fleet would be successful at Tyra. However, the fleet was defeated and suffered incredible losses; 98 ships were destroyed or damaged beyond repair, only fourteen ships made it back to Federation territory. The battle badly damaged the allies' morale. (DS9: "A Time to Stand")
Kagan, a hologram in a Section 31 holoprogram, claimed to have been with the Seventh Fleet at Tyra, where he said he had lost a lot of friends. Julian Bashir also knew several people who were killed in the Tyra system. (DS9: "Inquisition")
|Major battles of the Dominion War|
|2373: Second Battle of Deep Space 9 • Battle of Torros III|
|2374: Battle of the Tyra system • Operation Return • Battle of Betazed • Liberation of Benzar • First Battle of Chin'toka|
|2375: Destruction of Monac shipyard • Raid on Trelka V • Siege of AR-558 • Battle of Ricktor Prime • Invasion of Septimus III • Breen attack on Earth • Second Battle of Chin'toka • Battle of Rondac III • Battle of Avenal • Battle of Cardassia|