Dennis Oliver is the author of over twenty books on Second World War armoured vehicles including Codename Swallow: British Sherman Tanks at Alamein, To The Last Bullet: Germany's War on 3 Fronts, Westwall: German Armour in the West 1945, Viking Summer, A Sound Like Thunder, Tiger I and II Tanks of the German Army and Waffen-SS: Eastern Front 1944 and Sherman Tanks of the British Army and Royal Marines: Normandy Campaign 1944.