Dr Russell A. Hart is Professor of History and Director of the Diplomacy and Military Studies Program at Hawai'i Pacific University, Honolulu, Hawai'i. He has co-authored numerous books, including three Osprey titles: The Second World War, Part Six: Northwest Europe, 1944-1945 (2002); The Second World War: A World in Flames (2004) and The Second World War (2018) . He lives in Kailua, Oahu, Hawaii. Dr Stephen A. Hart is senior lecturer in the War Studies department, the Royal Military Academy Sandhurst. Prior to this he lectured in the International Studies Department at the University of Surrey, and in the War Studies Department, King's College London. He is the author of Montgomery and the 'Colossal Cracks': The 21st Army Group in Northwest Europe 1944-45 (Praeger, 2000).