[Oggy ben Doggy]

I got in a war, and mostly won. At least, I exterminated the buggers whereever I could find them.

They would periodically threaten me, say there were going to launch an offensive, etc. I mostly ignored them

Then I was checking an uncolonized world in one of the systems I conquored, and noticed that the moon was colonzied by my enemy. But in the main (solar system) map, there was no indication (the little flag thing) that the world was colonized.