Dr Graham Watson, is a graduate of the Universities of Edinburgh and Glasgow and was a lecturer in history at University of Wales at Cardiff from 1969 until 1995. He is Regimental Historian, Royal Monmouthshire Royal Engineers (Militia), and author of their history, Militiamen and Sappers. He is also the author of Terriers & Sappers: Lineage of the Reserve Regiments and Squadrons of The Corps of Royal Engineers, 1908-1999. He teamed with Cliff Lord to produce The Royal Corps of Signals: Unit Histories of the Corps (1920-2001) and its Antecedents, a sponsored official history, and with Mike Cox for Pour la France: A Guide to the Formations and Units of the Land Forces of France 1914-1918 (Helion 2012). Richard Rinaldi is a graduate of Swarthmore College and Yale University. Formerly a human resources specialist with the federal government, he has had a long-term interest in military history, especially the British and US armies. His The United States Army in World War I: Ground Units, 1917-1919 was published in 2005; Order of Battle of the British Army 1914 in 2008; and British Armour and Recce in the Second World War: Units, Organization and Equipment in 2013; as well as (with Ravi Rikhye) Indian Army Order of Battle in 2011.