Carl von Clausewitz entered the Prussian military at the age of twelve as a Lance-Corporal and would go on to obtain the rank of Major-General. In "On War", Clausewitz draws upon his experiences fighting in the French Revolution and Napoleonic Wars, as well as his military studies at the "Kriegsakademie", or Prussian War Academy, which he would eventually become director of. Clausewitz employs a dialectic approach to military analysis, which leads to frequent modern misinterpretation. "On War", a mainstay of modern military colleges, is a monumental work of military analysis and philosophy, which continues to be studied and interpreted to this day.