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A verdant world occupying a strategic position in the Mid Rim, Kashyyyk was the site of a fierce fight between the Republic and Separatist invaders in the final days of the Clone Wars. Jedi Masters Luminara Unduli and Yoda were among the commanders of a mixed force of clones and Wookiees that defended the coastal city of Kachirho.
During the fighting, Supreme Chancellor Palpatine issued Order 66. Unduli was believed killed, but Yoda sensed danger and struck down the clones sent to kill him. He then escaped the planet with help from friendly Wookiees.
The Empire conquered Kashyyyk and subjected it to a brutal occupation, enslaving the Wookiees and using them as laborers. Many died due to brutal working conditions on planets such as Kessel. The Wookiees resisted Imperial occupation, with repeated uprisings triggering vicious retaliation by the Empire.