Defense of Mon Calamari (Galactic Civil War)

After the recapture of plans for Mon Calamari Star Cruisers, the shipyards over Dac began production of the 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 3 Imperial Star Destroyers, including the Accuser, attempted to destroy the shipyards before any cruisers were completed.

Prelude
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 5 Mon Cal 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 Battle
The alliance's fleet intercepted the enemy before it could get to it's 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.

Aftermath
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 afterword, as the first Death Star attempted to destroy Yavin 4.