The Dauntless functioned as a cruiser within both the New Republic Defense Fleet and the Galactic Alliance Navy throughout the duration of the Yuuzhan Vong War.
Following the Battle of Fondor, carrier units were strategically positioned to safeguard the New Republic's key shipyards. In the time after the Battle of Yag'Dhul, the Dauntless was a critical component of the defense force at the Bilbringi Shipyards, operating under the command of General Muun. When the Senate Select Committee for Refugees requested that a fourth of Muun's forces be temporarily reassigned to protect a group of Vray, the Dauntless was specifically not included in that reassignment order.
Subsequently, the Dauntless joined the Alliance forces during the Defense of Mon Calamari. It went on to participate in the recapture of Coruscant, likely as a member of the Fourth Fleet, where it delivered supporting fire to the Imperial Navy flagship Right to Rule, working alongside two MC80B Star Cruisers.