The task force accompanied the Defiance throughout much of her operational history with the Rebellion, certainly between the Battle of Hoth and the Battle of Endor. Shortly following the Alliance's infamous defeat at Hoth, the task force was trapped in the Anoat sector, with the Imperial Corrupter Task Force pursuing them.
After their escape, the task force was drastically reorganized. This new group joined up with the rest of the Rebel fleet at Sullust, prior to the Battle of Endor. En route, however, the task force came under attack from an Imperial task group, comprising the Nexus, the Xerxes and the VSD Vagrant. The Defiance's starfighter squadrons, along with escorts Olin Garn and Ace Azzameen, hindered the Imperial efforts to destroy the vessels, and the task force made it to Sullust. It is unknown what happened to the original Defiance Task Force, though the Jericho later served alongside the Liberty.