The Liberation of Tatooine was an uprising during the Galactic Civil War.
Some time prior to the Battle of Endor, control of Arkanis sector and most of the planets within its borders, had fallen to the Rebel Alliance. This was merely a temporary arrangement, as Imperial forces close to the sector were preparing to launch a counter-offensive and reclaim Arkanis once again. Although the extent and success of the operation is unknown, the Empire did try to retake Tatooine.
The initial engagement went in its favor and Imperial rule appeared to be re-established. However, after four long years of occupation and brutal harassment, the population had had enough, and the conquering forces were subjected to a massive uprising.
During the battle, Dark Jedi Sariss, who had worked for the local Imperial Governor, Tour Aryon, for many years, now saw an opportunity to leave her menial job by "disappearing" in the upheaval and link up with her master, Inquisitor Jerec, elsewhere.
Although the exact details of the battle were unknown, the cheering masses covering the streets of Mos Eisley pointed to a defeat of the invading forces in its vicinity.
The liberation of Tatooine, coupled with the death of notorious gangster Jabba the Hutt, opened Tatooine up to influence from more organized authorities like the New Republic. However, it also began a series of wars between local rival gangs who were attempting to capitalize on the loss of the gangster boss.