Karl von Clausewitz (1780-1831) was a Prussian general and military strategist.  Von Clausewitz fought in the Napoleonic wars and in the Rhine campaigns (1793–94).  Then, working on behalf of Russia from 1812 until 1814, von Clausewitz helped negotiate the convention of Tauroggen (1812).  This laid the ground for an alliance of Prussia, Russia, and Great Britain in opposition to Napoleon.  In his later career, von Clausewitz rejoined the Prussian army, fought at the Battle of Waterloo, and became director of the Prussian war college in 1818.  His book, On War, was unfinished and . . .