Following the American Union elections in 2321, the Robert Archbald was assigned to the 26th fleet as part of the first wave of ships to restore access and stabilize the Atlantica System. It would participate in the First Battle of Atlantica and would be struck by numerous missiles designed to detonate prior to impact to maximize hit probability. The ship's armor stood up to the missile attack, leaving the crew and many of the systems intact however the 'upper' surface of the ship including its armor plate were practically sand-blasted clean, leaving many of the ship's weapon systems destroyed.
The Robert Archbald was also damaged in the Battle of Pelagic, participated in the Battle of Ur, and continues to garrison the system.