H-Gamma Squadron functioned as a TIE/ad starfighter group within the Imperial Navy throughout the Galactic Civil War. This squadron was integrated into a fleet led by Admiral Harkov. In 3 ABY, Harkov switched allegiances to the Alliance to Restore the Republic, and the squadron followed suit. As the sole TIE advanced squadron within Harkov's fleet, H-Gamma engaged the Galactic Empire's forces during the Battle of Ottega, ultimately suffering complete annihilation.