It was completed in 21 BBY[1] along with the Venators Resolute and Pioneer. They were assembled together to act as a battle group, and as their first mission, they were put under the command of Jedi GeneralAnakin Skywalker.
Along with the other two ships, the Dauntless was sent to Bothawui, to defend it from GeneralGrievous. On the way to Bothawui, they had a couple of minor skirmishes with Grievous's fleet, but were able to reach it before they did. It participated in the Battle of Bothawui, when Grievous finally arrived there.