Nagai-Tof War

The Nagai-Tof War was a conflict between the newly formed Alliance of Free Planets, the Galactic Empire, and the invaders of the Nagai and later the Tof species from the Unknown Regions. The actions of the Nagai very nearly stopped the formation of a new Galactic government in the Alliance of Free Planets and marked the first widespread appearance of the new Dark Lady of the Sith Lumiya.
The conflict started with small infiltration units of Nagai ordered to disrupt the workings of the Alliance to pave the way for the Nagai Main Fleet. Commander Ozrei N'takkilomandrife, the most talented of these Nagai agents, almost succeeded in restarting the Wookiee slave trade. The arrival of the Nagai Fleet, allied with the Galactic Empire, resulted in all out war; however, the arrival of the Nagai's mortal enemies, the Tof resulted in the Nagai and Empire allying with the Alliance to stop this new threat.
The war also marked the first time Luke Skywalker was defeated in a duel after the death of his father, Darth Vader. The Dark Lady Lumiya defeated the Jedi with a lightwhip on Kinooine. The war concluded with the capture of the Tof leader Sereno and the brutal maiming of Lumiya. The end of the war was the last time Lumiya was seen publicly for over 35 years.