As promised, CDV Software today announced that Blitzkrieg: Rolling Thunder, the second add-on for the popular WWII RTS game by Nival Interactive. has shipped to North American retail outlets. Blitzkrieg: Rolling Thunder offers 18 historically accurate missions based on the combat actions of the legendary American general, George S. Patton. Gamers will fight their way across seven countries, including North Africa, Sicily, France and Belgium.