I have the same bug as this guy: http://forums.cybernations.net/index.php?showtopic=56638
I deployed all my soldiers and tanks, I checked the battle odds on all my opponents, then when I went to start making attacks, all of my deployed soldiers and tanks were auto-returned home in the span of about 5 seconds. All my odds were ~50%. I can not deploy again for today either. My deployed tanks/soldiers now shows 0 and everything is defending.
Edit- this did occur BEFORE I was nuked, I checked the screen, messages, and it was as I said.