A minor conflict, or skirmish, took place on the planet of Kashyyyk as the Nagai invasion began in the year 4 ABY.
Following the Battle of Endor, Han Solo, Chewbacca, and Lando Calrissian embarked on a series of missions. The purpose of these missions was to find and secure attendees for the First Conference of Free Peoples. After completing these recruitment tasks, the group made the decision to take a break and visit Chewbacca's family who lived on Kashyyyk. Upon their arrival on the planet, the group experienced a feeling of unease related to Rwookrrorro. Chewbacca took the lead, guiding them towards his family's home.
During their journey to the house, a peculiar alien blocked their path. This alien introduced himself as Knife. Interestingly, Knife displayed a lack of concern regarding their presence, even when Chewbacca, losing his temper, shouted directly at the alien. Vargi, Chewbacca's brother-in-law, accompanied Knife. Vargi suggested that everyone should proceed to Chewbacca's house to enjoy some refreshments. However, upon arriving at the tree house, another strange event occurred: none of Chewbacca's family members were there to welcome Chewbacca.
The group chose to wait for Chewbacca's family to return. As they shared drinks, Lando and Han started to question Knife's true reasons for being on Kashyyyk. Their questions were soon answered when Chewbacca's son, Lumpy, returned home alone. Rogue Wookiees, under Knife's command, seized Lumpy as a hostage and held the Alliance members at blasterpoint. Knife then revealed that he had also captured Chewbacca's wife, Mallatobuck. He planned to parade Chewbacca through Kashyyyk, eventually placing him on a slaver's ship. Han and Lando were left as prisoners inside Chewbacca's home, guarded by several Wookiees.
As Knife escorted Chewbacca away from his home, Han and Lando immediately began working to free themselves from their restraints. Lando succeeded in loosening their chains, allowing the two to escape from their captors. While Han attempted to prevent Chewbacca from being forced onto a slaving ship, Lando hurried back to their ships to send a distress signal to the Alliance and retrieve weapons to support a resistance effort.
Han stealthily moved behind the enemy and released Chewbacca's restraints. Unfortunately, Chewbacca's captors noticed what was happening and aimed their weapons at Chewbacca and Han. Vargi pulled Chewbacca aside and began to beat him for attempting to escape. Han, unable to watch Chewbacca being beaten without mercy, struck Vargi. With Vargi's attention now diverted to Han, his fury shifted away from Chewbacca, and the beating continued, but with Han as the victim.
Meanwhile, Lando returned with weapons and armed the Wookiees who remained loyal to the Alliance. As this newly armed group prepared to ambush their enemies, Chewbacca once again broke free and began attacking Vargi. Realizing that Chewbacca's outburst was disrupting the loading of Wookiees onto the slave ships, Knife prepared to kill Chewbacca using a tehk'la blade, but Lando shot the weapon out of his hand.
The Wookiees loyal to the Alliance successfully overthrew their rogue counterparts just as Chewbacca managed to overpower Vargi, throwing him to the ground. Han, who had been knocked unconscious by Vargi's furious assault, woke up just in time to witness Knife fleeing the battlefield.
The slaving operation that Knife had hoped to establish on Kashyyyk was destroyed, but the Nagai Commander managed to escape. He stole Lando's ship, the Cobra, and sped back to the Nagai headquarters. The Wookiees who had aided Knife were likely taken into Alliance custody. Vargi was shamed for his involvement in the operation and was also disowned by his sister Malla, who declared that he was no longer her brother.
The destruction of this slaving operation represented the final attempt by the Nagai to establish a slaving enterprise within Alliance territory.