Rothbard on the Libertarian Attitude Toward War

Excerpted from War, Peace and the State:

The libertarian's basic attitude toward war must then be: It is legitimate to use violence against criminals in defense of one's rights of person and property; it is completely impermissible to violate the rights of other innocent people. War, then, is only proper when the exercise of violence is rigorously limited to the individual criminals. We may judge for ourselves how many wars or conflicts in history have met this criterion.

Murray Rothbard, A Libertarian Theory of War