Bane Crisis

The Bane Crisis was a war fought between the Republic and the Disciples of Bane led by Sith Lord Darth Galepius. However, it was actually all a plot by Sith lords Darth Plagueis and Darth Sidious to destroy those dark Jedi that were a threat to their plans.

The Crisis Begins
For ten years before the war began, Galepius had been gathering students to train in the dark side of the force and soldiers to lead his army. Darth Razor on Khaleen, Darth Clous on Kessel and Darth Verona were all drafted into his service. Soldiers like Mera Dan and Commander Bacqui served to liase between the Sith and their land and space forces respectively.

The Sith established their base in the highlands of Eriadu, constructing a vast fleet to launch against the galaxy while Darth Clous gathered an army that was trained by Darth Verona and Mera Dan. Finally, fifty years before the Clone Wars, they were ready to strike.