Post Old Republic Era

Little is known about the return of the sith, seemingly out of no where. But they came in mass numbers, and defeated the Republic in a
few swift moves, but strangely stopped and signed a treaty splitting the galaxy in half and resulting in a cold war with the Republic. It
would seem Revan was right about the threat.
Much of the information which is unavailable will be elaborated in Bioware's upcoming video game The Old Republic, which is, on a
side note, the most expensive video game ever developed.

Below is a video trailer of the game, showing the invasion of the sith.