At 10:15 on 09/10/2007 I nuked Greatful Sound, Nation ID 90961, and received the following message:
Your nuclear attack against Greatful Sound was a success. Greatful Sound lost 0 defending soldiers, 1,277 defending tanks, 9 cruise missiles, 150.000 miles of land, 150.00 infrastructure, and 1/4 of their aircraft force. In addition to these losses Greatful Sound will experience many days of economic devastation in their nation.
He still has 256,151 soldiers, 211,153 of which are still on defense. According to the nuclear weapon FAQ, it is supposed to wipe out defending troops.