First Gorek'gatan was a Jem'Hadar soldier for the Dominion during the 24th century. He commanded the 4513th Battalion, which was sent to reinforce the Cardassian Union after it joined the Dominion. Following the closing of the Bajoran wormhole his unit was redesignated the 37th Battaltion. (The Dominion War Sourcebook: The Fires of Armageddon)