Tvrrdko desired revenge when Chewbacca killed his son after Tojjevvuk used his claws in a duel with him. After Order 66 was executed during the Clone Wars and Chewbacca was captured, Tvrrdko sold him to a Trandoshan slaver named Ssoh. In one of Ssoh's ships cells, Chewbacca allied with other Wookiees, took over the ship, and brutally maimed Ssoh. Around that time, he rescued Wookiee children that belonged to Tvrrdko's clan, ending the feud between them. Tvrrdko showed his gratefulness to Chewbacca by carving a portrait of Chewbacca into a large Wroshyr tree on Kashyyyk after the famous Wookiee's death.
- The Official Star Wars Fact File12
- Star Wars: The Comics Companion
- "Han Solo: The Early Years" — Star Wars Insider 106