Also known as the Second Sith War, the Malak War, and by the Mandalorians as the War of the Star Forge, was a devastating conflict that began when the Jedi Knight Revan, founded his own Sith Empire and declared himself the Dark Lord of the Sith.
The war began when he, along with his friend and apprentice Darth Malak, led an invasion of the Galactic Republic in the year 3959 BBY, returning from the Unknown Regions with a massive Sith fleet, seizing control of Korriban, revitalizing the Sith Academy there and gaining access to the Star Forge.
During the war, Darth Revan brought the Republic to its knees and nearly succeeded in conquering it, however, a trap set by the Jedi and unwittingly abetted by Malak left him comatose, with his mind nearly destroyed.