Following the release of the RUSE taster yesterday for PlayStation Plus subs on PS3, Ubisoft's put out a PC demo of the RTS.
You'll play a full mission as Allied Forces as you face the Nazis and some Italian units. You must lead from HQ and head into nuclear warfare, according to the Steam page. As you do.
You can get it here.
RUSE releases on September 9 in Europe for PS3, 360 and PC.