The Battle of Typhon was a large battle between Lyran forces on one with Federation and Romulan forces on the other. Intelligence gathered from a Krivaldi ship on Shydal Prime indicated that elements within the Lyran Star Empire had expressed interest in joining the Krivaldi, Breen, and Dominion coalition. Fearing another front in the war then Vice Admiral Jolias Enor gathered a task force of over one-hundred Federation ships and intercepted the still larger Lyran Force near the Typhon Expanse. The battle raged on and the Federation forces were slowly being dismantled until Romulan reinforcements under the command of Shiarrael t`Rehu arrived sending the Lyran forced into disarray using the aptly dubbed Rehu Maneuver.
The Lyrans forced were quickly overwhelmed and offered their surrender. While Admiral Enor accepted the surrender, then Ael'Riov t'Rehu refused and obliterated the remnants of the Lyran fleet. In some circles the incident would be dubbed the 'Lyran Massacre' however as she was acting within the confines of Romulan Military Policy she was never charged- although proceedings in the Federation are being insisted on by peace activists.