No other human activity is so continuously or universally bound up with chance. And through the element of chance, guesswork and luck come to play a great part in war.
Carl von ClausewitzWhenever armed forces . . . are used, the idea of combat must be present. . . . The end for which a soldier is recruited, clothed, armed, and trained, the whole object of his sleeping, eating, drinking, and marching is simply that he should fight at the right place and the right time.
Carl von Clausewitz