Battle of Csilla (Infinity War)

The Battle of Isolum was a large battle between the Predecessors and Dark Reach. It was ultimately a Predecessor victory, and the broke off and joined the Predecessors.

Prelude
The initial goal of the assault was for the Predecessors to find more allies, and since the have ben their ally before, they wanted to acquire their allegiance first. Eventually, the war goal for the Predecessors became liberating from Dark Reach occupation.

The battle
The Predecessor fleet hyperspaced in over, unexpected by Dark Reach, but no surprise. With their breakout at Isolum done, Dark Reach was at a state of alert at any given time, as a Predecessor fleet had been on the lose. The Predecessors had appeared with an entirely new fleet, and almost all starships in it were freshly designed and built. This demoralised the enemy, but it didn't cause them to retreat. The Dark Reach fleet entered formation in order to combat the Predecessors, although when the Predecessors brought in the Len-class dreadnought, which was as tall as the distance between both fleets, several of the captains attempted to break off.

Arien Kol, the admiral in command of the fleet, ordered for these captains to return to their positions or be executed. Some, deciding they would get killed anyway, retreated anyway, while others went back into the battlefield. A quarter of the Sith fleet had already been destroyed, and the Predecessors had not lost a single ship yet. Unknown to the Predecessors however, was that a combined - fleet was rallying behind them, preparing to strike. Admirals Dec'eva'ronian and Vin Fuur then ordered for their fleets to approach.

Crax Salueís, a veteran and war hero, was in carge of the entire Predecessor fleet. He commanded admiral Becarn Levíus to take a portion of the fleet and destroy the Yevethan and Chiss fleets, while he dealt with the remainder of the Sith fleet. Unknown to Vin or Arien, Cevar had contacted Crax and Becarn, saying that he will surrender and that he will convince the to join the Predecessors in this war, if the fleet is left in tact. Both admirals agreed to it, and they would not open fire upon eachother. As soon as both fleets hit, Cevar retreated his fleet away from the battle, shortly after which, he entered contact with the Chiss government, which was already scared of the massive dreadnought right next to them.

Becarn's fleet was technically superior, not only because these ships were freshly built, but also because the Predecessors have better technology than them, or anyone, in the galaxy. Becarn ordered his fleet to surround the Yevethan fleet, and while not the best tactic, as Becarn lost a few vessels, it was effective, as the Yevethan fleet was destroyed with capable ease, and Vin Fuur killed with that. Becarn then Manoeuvred back towards Crax, who was destroying the final Sith ships.

A few minutes later, the battle was over, with the Predecessor fleet waiting in the sky for the Chiss emergency session to finish. Cevar contacted Crax later on, and said that the session was a success, and that the Chiss Ascendancy would align itself with the Predecessors. With that, the Predecessor fleet left, with the Chiss fleet in tact.

Aftermath
The battle of, together with the strikes at Aradan and Cerci IV, secured new allies for the Predecessors.