Alvak was present at the Battle of Reytha during the Imperial-Sith War in 130 ABY. On the Montrosa Islands on the planet of Reytha, the Galactic Federation of Free Alliances set up a shipyard. Alvak, serving under then-Captain Malcor Ashen, was the gunner of the lead AT-AT. He destroyed the fortifications and command center of the shipyard. After the battle, he returned to the orbiting Star Destroyer.