Gunner was apart of the 501st Legion. He served at the Battle of Zeenada. Gunner served under the Command of Captain Rex and Jedi Commander Ahsoka Tano during the Battle of Zeenada, where Gunner was assigned a special task.
Gunner and Sarge were assigned to create a diversion behind the enemy lines while Jedi General Anakin Skywalker, Tano and Rex led the primary attack against the droids. In part, due to Gunner and Sarge's heroics, the Republic won the battle.
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