Translated into English several times as On War. 

Vom Kriege (German pronunciation: [fɔm ˈkʁiːɡə]) is a book on war and military strategy by Prussian general Carl von Clausewitz (1780–1831), written mostly after the Napoleonic wars, between 1816 and 1830, and published posthumously by his wife Marie von Brühl in 1832.

On War is the most significant attempt in Western history to understand war, both in its internal dynamics and as an instrument of policy. Since the work's first appearance in 1832, it has been read throughout the world, and has stimulated generations of soldiers, statesmen, and intellectuals.

TABLE OF CONTENTS:
THE INTRODUCTION OF THE AUTHOR
BRIEF MEMOIR OF GENERAL CLAUSEWITZ
BOOK I. ON THE NATURE OF WAR 
BOOK II. ON THE THEORY OF WAR
BOOK III. OF STRATEGY IN GENERAL 
BOOK IV. THE COMBAT