There is a great analysis of terrorism and guerrilla warfare at the USS Clueless.

(Captain's log): There may be few words today which are more politically important, more widely used, and less understood than the word terrorism. Even trying to come up with a dictionary-style definition for the term is not easy. Having every radical out there suddenly decide that their mortal enemies are "terrorists", in some way or other, doesn't help any. Nor is the situation clarified by supporters of terrorist groups who deny that they are terrorists...

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