Chewie's POV (from Han's translation)
During the Battle of Kashyyk, the clone troopers were aware that the Wookies were on the Jedi's side so they began their enslavement of them.
After Chewie and Tarfful helped Yoda escape, the clones cornered them and held them as traitors. Tarfful went into rage and tried to fight them off, but was killed.
Chewie was stunned. When he woke up, he found himself in a prison camp, ready to be a slave, to the new Empire.
Han: "Sorry to put you through that, buddy."
Chewie: "Graawwwaaaww!"
Han: "Well on to the story."