The USS Atlas was a Sovereign-class starship in service to Starfleet in the 24th century. The Atlas was in active service in the late 2370s. (TNG video games: Armada, Armada II)
In 2381, the Atlas was under the command of Captain Morgan Bateson and fought as a part of a 40 ship armada against the massive Borg invasion.
Atlas was the flagship of the task force assigned to protect the planet Vulcan. When ten Borg cubes arrived at the system, the Atlas engaged the enemy using transphasic torpedoes. Bateson's ship was eventually able to destroy several cubes before the Borg could finally adapt to the weapon and started their counterstrike.
Most of the task force was destroyed, but the heavily-damaged Atlas managed to outmaneuver the Borg. When the collective started to fall into chaos due to Captain Erika Hernandez's link to the hive, the last Borg ships started to attack each other. The few that survived the fire exchange were destroyed by the Atlas, and Vulcan was saved again. (ST - Destiny novel: Lost Souls)
Following the invasion, the Atlas reported to Starbase 22, where station's counselor, Brian Ellis, counselled the Atlas medical staff. (ST novel: A Singular Destiny)