John Sadler John Sadler has had a lifelong interest in military history. He now combines writing with lecturing in History at Newcastle University and working as a battlefield tour guide, living history interpreter, and heritage consultant. He has travelled extesively in Scandinavia and is thus familiar with all of the principal sites and saga/literary sources and is an acknowledged expert on the Viking art of war . He is the author of more than 40 books. He lives in mid-Northumberland. Read More Read Less