During the early years of the Galactic Civil War, the shipyards over Dac began production of new ships for use in the Alliance Fleet. In an attempt to stop them from using the ships, a massive Imperial fleet, spear-headed by three Imperial Star Destroyers, including the Accuser, attempted to destroy the shipyards before any cruisers were completed.
Using Han Solo to capture plans for Mon Calamari Star Cruisers was a success, and shipyards over Dac began production of the cruisers. However, the Alliance discovered that a major Imperial fleet was massing over Coruscant, with the intent of invading Mon Calamari. Allowing this to happen was not an option.
Sending a detachment of their own fleet to join five Mon Calamari Cruisers, including Admiral Ackbar's Home One, over Mon Calamari, Alliance Space Stations were set up along hyperspace routes to stop the enemy's advance.
The Alliance's fleet intercepted the enemy before it could get to its destination. Brutal fighting began, with both sides taking casualties. However, the rebels had the advantage, due to the space station, and the Imperials were losing the battle.
The new rebel cruisers proved their worth, as they managed to destroy the enemy flagships. Coupled with the rebel starfighters, the ships destroyed the Imperial Star Destroyers, and with them down, the rest of the Imperial fleet fell quickly.
The destruction of the invading fleet meant that the rebels significantly upgraded the Alliance Fleet. Even though the Accuser was hastily repaired, the rebel were clearly capable of destroying Imperial Star Destroyers.
However, Mon Mothma was unnerved by how apparently unconcerned the Galactic Empire seemed about the loss of such a large fleet. She thought that the Empire must have a plan to destroy the Rebellion. She was proven correct shortly afterward, as the first Death Star attempted to destroy Yavin 4.
This battle was the eleventh mission of the Rebel campaign in the 2006 video game Star Wars: Empire at War.