Fire Power: The British Army – Weapons and Theories of War, 1904-1945: The British Army – Weapons and Theories of War, 1904-1945 (Pen & Sword Military Classics) by Shelford Bidwell & Dominick Graham

This is, without doubt, the finest book about the crucial role that artillery played in the two World Wars of the Twentieth Century. The authors, both former artillery officers who saw action in World War Two, describe the development of their neglected, inadequate and class-ridden arm through the battles of the First World War and the eventual war-winning role that artillery played, to the culmination of professional military deployment in the Second World War.