Carl von Clausewitz Quotes
The first and most important rule to observe...is to use our entire forces with the utmost energy. The second rule is to concentrate our power as much as possible against that section where the chief blows are to be delivered and to incur disadvantages elsewhere, so that our chances of success may increase at the decisive point. The third rule is never to waste time. Finally, the fourth rule is to follow up our successes with the utmost energy. Only pursuit of the beaten enemy gives the fruits of victory.
von Clausewitz, Carl. Principles of War. Translated by Hans W. Gatzke, Military Service Publishing Company, 1942, p. 45.
Carl Philipp Gottfried (or Gottlieb) von Clausewitz was a Prussian general and military theorist who stressed the "moral" (meaning, in modern terms, psychological) and political aspects of war. His most notable work, Vom Kriege transl. On War, was unfinished at his death.