Cruisers were aquatic siege weapons armed with one laser cannon used by the Wookiees on Kashyyyk. Heavy Cruisers were upgraded versions with heavier armor and two laser cannons. Shortly after the Battle of Endor, the resistance fighter Shoran ordered four Heavy Cruisers belonging to his personal army in Tunnatutikan to go up a river on a scouting mission. He lost contact with them after they were captured by Trandoshan slavers. The New Republic members Han Solo and Chewbacca ventured to Kashyyyk to assist in its liberation and joined with Shoran to destroy three Imperial jammers.