By 2165, he held the rank of commander and was in command of the courier ship USS Zabathu. In April of that year, the Zabathu was assigned to Captain Malcolm Reed's task force that went into Ware territory.
In June, the Zabathu was in orbit of the planet Vanot, she was tasked with supporting Lieutenant commander Travis Mayweather's away team investigating Ware facilities on the planet. The away team was captured by a local businessman, Daskel Vabion, and forced them to take him to the source of the Ware. Maywearther ordered ch'Mezret to take them to the Ware hub complex.
On the way there, a Ware command ship intercepted and disabled the Zabathu and beamed over everyone. After this ch'Mezret and his crew were dispersed to several Ware battleships in the attack fleet that attempted to retake the hub complex from the Starfleet task force, but they were ultimately retrieved unharmed. (ENT - Rise of the Federation novel: Uncertain Logic)