The Battle of Balos was the final battle of the Dilgar War.
All Dilgar Warmasters were captured and tried for their crimes, except for one, Jha'dur, who disappeared during the fighting. The League's warships then entered orbit around the Dilgar homeworld and accepted their unconditional surrender.[1]
As part of that surrender Earth forces blockaded the Dilgar Jumpgate, confiscated all the Dilgar's Quantium 40 supplies as reparations and imprisoned the Dilgar in their home solar system. After the war ended, the Dilgar sun went supernova, wiping out the entire species.
Unknown to Earth and the League, a single Dilgar survived both the war and the supernova: Warmaster Jha'dur, Deathwalker, the most infamous leader of the invasion.
Jeffrey Sinclair's father David Sinclair flew for Earthforce during the Dilgar invasion and was there when they liberated Balos. According to Jeffery, his father never forgot what he saw there.[2][1]