Well, the Rebels are strategic, so they would first take out the Eclipse's super-laser, and they would boost their shield power every time the Eclipse would try to use the super-laser, or the Death-star use it's super-laser. Then, of course, the Rebels would take down the Eclipse the rest of the way. But then if none of the Mon Calamari ships had Rogue squadron or Luke in their hangars, then I would say that the rebels would be toast if they didn't hyperspace away.