(well i would assume that would be costly to get a full missile load so i would say you don't have enough missiles to wipe out a whole fleet due to cost)
After some time, The joint Republic fleet had managed to crush Marnix's fleet, but the losses were staggering. The remaining forces closed in on the Star Forge and began to fire.
Rez: It's about time we got this guy! That Star Forge can't hold out forever in the face of persistent fire...it will crumble soon enough.