ALSO AVAILABLE TO BUY AS AN E-BOOK. The original forced conversion of pagan Livonia, what is now the Baltic states of Latvia and Estonia, was carried out by a military order known as the Brethren of the Sword. In 1236 this order was incorporated into the Teutonic Knights following a catastrophic military defeat. The knights had always consolidated their conquests through networks of castles and fortified places, and the Livonian Chapter of the Teutonic Order built castles of stone. This title covers the developmental and operational history of these fortresses over the length of the Middle Ages. It details how the Baltic fortifications of the Teutonic Knights evolved to reflect the changing nature of siege warfare and the increasing dominance of gunpowder in warfare.

Stephen Turnbull has published several books on the subject of warfare in Medieval and Early Modern Europe, and has developed a strong interest in Eastern European armies such as the Hussites and Muscovy. His books are always based on extensive scholarly research coupled with in depth study tours of the countries he is describing.

Peter Dennis was born in 1950 and, having been inspired by contemporary magazines such as Look and Learn, studied illustration at Liverpool Art College. He has since contributed to hundreds of books, predominantly on historical subjects. He is also a keen wargamer and modelmaker.