|Sirius Prime, Gilead, Warsaw
|Sol, Tikopal, Luyten, Weslyn, Proxima
During the year 2668, the Kilrathi Empire launched a massive assault on the Sol Sector with its newly-refurbished fleet, intending to destroy the Terran homeworld of Earth. They passed through the Sirius System while en route. Desperate to stave them off, the Terran Navy sent every available ship and pilot to stop the Kilrathi while they were still in Sirius, resulting in the Battle of Sirius.
Despite the undeniable bravery of the inferior Terran fleet, they were hopelessly outgunned and sustained enormous casualties before finally retreating. The Kiralthi then launched thermonuclear warheads on Sirius Prime, Warsaw, and Gilead, slaughtering over two billion people. The Kilrathi continued onward to Earth, where the surviving remnants of the Terran fleet fought to the death to save their planet.