“If war is the continuation of politics by other means, terrorism is the continuation of war by other means.”

As quoted in Saturday Evening Post (27 March 1954); this is a play upon the famous maxim of Clausewitz: "War is the continuation of politics by other means".

Progress, Coexistence and Intellectual Freedom (1968), Dangers, The Threat of Nuclear War

Drafts for a Third Sketchbook (2013)

From Ctheory Interview With Paul Virilio 'The Kosovo War Took Place In Orbital Space: Paul Virilio in Conversation with John Armitage' http://www.ctheory.net/text_file.asp?pick=132

In this sense war is politics and war itself is a political action; since ancient times there has never been a war that did not have a political character... But war has its own particular characteristics and in this sense it cannot be equated with politics in general. "War is the continuation of politics by other means."When politics develops to a certain stage beyond which it cannot proceed by usual means, ware breaks out to sweep the obstacles from the way. When the obstacle is removed and our political aim attained the war will stop. But if the obstacle is not completely swept away, the war will have to continue till the aim is fully accomplished.... It can therefore be said the politics is war without bloodshed while war is politics with bloodshed.
On Protracted Warfare (1938)

As quoted in "Neo Rauch: ‘For Me, Painting Means the Continuation of Dreaming by other Means’" at the Goethe-Institut (February 2007) http://www.goethe.de/kue/bku/thm/kab/en2085683.htm

(zh-CN) “战争是政治的继续”，在这点上说，战争就是政治，战争本身就是政治性质的行动，从古以来没有不带政治性的战争。
1930s, On Protracted Warfare (1938)

Stefan Aust, Terrorism in Germany: The Baader-Meinhof Phenomenon http://www.ghi-dc.org/files/publications/bulletin/bu043/45.pdf

De Re Militari (also Epitoma Rei Militaris), Book I, "The Selection and Training of New Levies"
Context: Victory in war does not depend entirely upon numbers or mere courage; only skill and discipline will insure it. We find that the Romans owed the conquest of the world to no other cause than continual military training, exact observance of discipline in their camps and unwearied cultivation of the other arts of war. Without these, what chance would the inconsiderable numbers of the Roman armies have had against the multitudes of the Gauls? Or with what success would their small size have been opposed to the prodigious stature of the Germans? The Spaniards surpassed us not only in numbers, but in physical strength. We were always inferior to the Africans in wealth and unequal to them in deception and stratagem. And the Greeks, indisputably, were far superior to us in skill in arts and all kinds of knowledge. (Book 1)