Clayton Donnell is a US Air Force Veteran. He has a degree in history and has passionately studied military history and fortress engineering for over thirty years. Clayton lived in Europe for many years and studied the architecture and archaeology of the most renowned fortress systems of Belgium, France and Germany. He created the first internet site in the world in English about the Maginot Line, and another on the fortress and Battle of Liège, Belgium. His publications include Modern European Military Fortifications, 1870-1950: A Selected Annotated Bibliography (edited with J.E. Kaufmann), The Forts of the Meuse in World War I, The German Fortress of Metz, Fortifications of Verdun 1874-1917, Shenandoah Valley 1862, Breaking the Fortress Line 1914, The Defence of Sevastopol 1941-1942: The Soviet Perspective, Maginot Line Gun Turrets and The Battle for the Maginot Line, 1940.