At one point the Fazrah actually broke through a field with 20-odd mines, but lost their sweepers and a couple combat ships in the process; the survivors were annihilated in the ensuing battle. Going the other way I had to sweep 30+. Overall I thought the Fazrah handled mines pretty well for an AI. I'm currently swallowing frontier colonies of the Aquilaeians and Tessellate, and my sweeper-escorted fleets have so far encountered no mines. It would seem prudent for an AI to deploy a few minelayers to its borders before declaring war. In fact it might be prudent even in peace.
Next game I'll try mine warfare in a gang-up-on-the-human conflict.
