I had upped my command for story/gem raids, and apparently was feeling stupid enough to go after someone WAY too big for me. Powered up my army is at 97k, and I attacked. The results were...
repair
46 motherships
damage
145 motherships
362,500 ore
ore 275,500
energy 137,500
That's right. I PERMANENTLY LOST 145 motherships from ONE pvp attack. I went from 97k army to 30.5. And that's WITH some being automatically reassigned.
Time to get back to ship building...
And, lesson learned: If you power up and acquire new targets...spy first. Or else you might get set back a full day and have to do a LOT of your own PVP attacks (against opponents you can WIN against) to make up for it!