One Sith War (NGW)

The One Sith War was a great assault led by One Sith Order in 288 ABY. The Sith attacked directly the Galactic Federation Triumvirate with the Siege of Bastion, giving life to a bloody war. In one single year, many planets were devastated by the Sith warriors and their troops, and the Triumvirate lost numerous Jedi and Imperial Knights.

However, with the Battle of Excarga the Triumvirate defeated the major part of the Sith and in some following fightings the divided Sith groups were routed out of the Outer Rim. This single groups formed the Exiled Sith, and someone was able to contact the others, but only years later.