Battle of the Bassen Rift

Prelude
The prelude to the Battle of the Bassen Rift was when a fleet of 16 Venator-class Star Destroyers and 8 Acclamator-class transports were positioned in the Unknown Regions with a space station that could build starfighters to refill the complements of their fleet. The fleet had been raiding Separatist outposts and stations, while always retreating back to the Bassen Rift to repair and resupply. The Separatist dreadnought Annihilator was ordered to decimate the fleet and leave no survivors.

The battle
The battle began when the Annihilator dropped out of hyperspace at the edge of the nebulae, when the Republic fleet deployed a fighter screen of V-wings and ARC-170's that were disabled and destroyed by the massive and heavily modified Subjugator-class heavy cruiser. As the cruisers charged their turbolasers, another ion pulse disabled 6 Star Destroyers which were later torn apart by proton torpedo's and turbolasers. As 10 cruisers and 8 transports remained, they fell back to the station into a staggered line.

As the battle was turning to the Annihilator, the Y-wings of the enemy fleet launched , with about a 400 bombers coming towards the massive Separatist flagship as lasers picked off limited numbers of bombers when a massive volley of thousands of proton torpedos impacted the hull of the Separatist dreadnought as the shields fell.

The wave of bombers closed to point-blank range as the turbolasers started firing at the massive wave of bombers, destroying at least 58 bombers , when the proton bombs of the Y-wings started puncturing the hull of the dreadnought when the fleet of republic cruisers and transports began to target the engines and reactors of the massive dreadnought , when the engines fell. The dreadnought was disabled faster than a bat out of hell under the constant bombardment of turbolasers and proton torpedo's, it wasn't long till the massive Separatist titan exploded in a massive burst of flames and debris.

Aftermath
The destruction of the second ever Subjugator-class only 1 year after the Malevolence's demise was a turning point in the war for the Republic as the dreadnought had taken an unthinkable amount of resources and time to build and modify it.

Behind the scenes
The Bassen Rift is originally from the movie Star Trek: Nemesis