The Prussian General Staff

It has often been asserted that one of the things that set the Prussian/German Army apart from others is the General Staff System. I can buy that the Prussian General Staff was the best and has been widely imitated. I don’t know however, if the Staff System itself gave the Germans a decisive edge in warfare. Staff work counts most at the beginning of a conflict and the German experience in WWI shows that even the best staff work and fastest mobilization does not guarantee victory. It can allow a nation to drag a war out but is not a war winning advantage in and of itself. My reading of Military History leads me to believe that the old saying about God being on the side of the big battalions is the best way to lead to victory.