Towards the end of the battle that cube was sniping ships left and right. That final explosion though...that was a big F.U to all those who survived except the big boys. The Galaxy, the Nebula and the Sovereign.
Geeze that was a brutal fight. And the cube taking out almost the entire task force as it exploded was awful. Yeah, they got the cube, but the casualty list would have been as bad as Wolf 359.