I said this in an edit, but here it is again
900 minions IS an army, and as I said, I wouldn't call the unseens much of a fighting force. Their summoned bodies are built to perform houshold tasks, not fight, and they all wear RED shirts, thats like an instant death sentence.
but I'd rather not hide behind semantics, so I'll throw in a rule that I will never have them be remotley effective in combat agaisnt anybody with a name, that includes you nameless. They will just generally suck.