The Sullust Liberation, a conflict that unfolded following the Battle of Endor, saw the New Republic wrest control of the planet Sullust from the clutches of the Galactic Empire. This victory was achieved following several months of intense combat. In the aftermath, Admiral Gial Ackbar and Mon Mothma accompanied Councillor Sian Tevv to the government building for the official ceremony of his inauguration.
Even with the planet freed, Imperial troops continued to operate from a derelict weapons depot located on Sullust. As they infiltrated the depot, Shriv Suurgav reassured Lando Calrissian of his familiarity with Sullust, citing his prior involvement in its liberation.
According to Star Wars: Timelines, the Liberation of Sullust occurred in 4 ABY. However, its mention in Battle of Jakku — Republic Under Siege 4 suggests a later date of 5 ABY. While Star Wars: The Rebel Files implied the participation of the Alliance to Restore the Republic in the battle, Republic Under Siege 4 clarifies that by then, the Alliance had already transitioned into the New Republic.