Sith purge

The Sith purge of 31 ABY was a serious of arrests and assassinations implemented by Darth Wyyrlok and Sith Intelligence in the wake of the Yuuzhan Vong War. Targeting those amongst the Sith Order of Decreto who sought to make war with the newly formed Galactic Federation of Free Alliances, Wyyrlok (who did not believe the Sith could survive a war against such a united foe) purged the Sith ranks of those who would undermine Wyyrlok and his Master in order to make war. Brutally successful, the purge achieved all its goals, and set the Sith military campaign back several decades and convinced many amongst the Sith that Wyyrlok's purge was little but a means to an end; acquisition of the title of Dark Lord.

The purge was so successful infact, that even by the arrival of Jasca Ducato in 38 ABY the Sith were greatly unprepared for the eventual coup that would occur.