After the Battle of Endor, the Wookiees were liberated from slavery by the Alliance of Free Planets. Sadly, the peace was short-lived. The Empire, having licked its wounds, quickly reestablished a presence on Kashyyyk and enslaved the Wookiees once more. Around 5 ABY Han Solo and Chewbacca assisted in inciting a revolution among the populace, helped in part by Lando Calrissian, Rogue Squadron, and Admiral Ackbar who took on Grand Admiral Peccati Syn in a pitched fleet-battle in the nearby Sumitra sector.
Viva la Rebelion!