So I've been playing the campaign, and I backed the AI into a corner where they stacked their fleet on their remaining worlds. Of course their total ships on each stack were around 25-30 so I positioned my own fleet around them, but couldn't figure out exactly why I couldn't attack with the bulk of my fleet. Each time I tried to send multiple fleets in at once they would attack one by one putting it 4 vs 30. Is there something I'm missing? The AI wouldn't even move from their position so it seemed there was no way to win without I suppose a pure tech advantage.