Just attended a two day conference 'How Terrorist Groups 'Learn': Innovation and adaptation in political violence' at the British Academy, London and the post-1919 conflict featured.

Researchers should check the writings of Dr William Sheehan, a historian:http://www.open.ac.uk/Arts/ferguson-...-sheehan.shtml

Here is one not-so happy review:http://www.theirishstory.com/2011/06.../#.VYW-jVI0piU

Not his book, another's on the "Black & Tans" and the 'auxiliaries' recruited by the British, a very controversial unit:http://www.drb.ie/essays/dogs-of-war