Yea, you alway should autoresolve against a dark wizard. Don't invade Russia in winter and autoresolve dark wizards, those are the truest statements in war history.
So the two truest principles of war are: Don't invade Russia in winter, autoresolve dark wizards, and don't bring a knife to a gunfight.
No, that's three. Yes, the three main things to remember about war are: Don't invade Russia in winter, autoresolve dark wizards, don't bring a knife to a gunfight. and never fight a land war in Asia!
Argh, that's four!