Mike OsborneDr Mike Osborne's interest in fortification began with childhood visits to castles, and has developed over the years to include all aspects of the topic, from Iron-Age forts to Cold War bunkers. He was a volunteer-coordinator for the Defence of Britan Project, recording the military structures of the twentieth-century, and, after a thirty-year-career in education, took early retirement. Since then, he has produced nearly twenty books on topics that range from Civil War sieges and fortifications, to drill halls and twentieth-century military structures. He has also written a series of county surveys of defences, as well as the best-selling Defending Britain. Read More Read Less