On War is one of the most important treatises on political-military analysis and strategy ever written, and it contains most of his larger historical and theoretical writings and represents his theoretical explorations.

On War is a book on war and military strategy by Prussian general Carl von Clausewitz, written mostly after the Napoleonic wars.

Carl von Clausewitz (1780-1831) was a Prussian general and military theorist. He stressed the "moral" (meaning, in modern terms, psychological) and political aspects of war. Clausewitz had many aphorisms, of which the most famous is "War is the continuation of politics by other means."