"Battle Studies: Ancient and Modern Battle" is a seminal military history book written by Charles Ardant du Picq, a colonel in the French Army who was killed in 1870 during the Franco-Prussian War. The book is divided into two main parts. In the first part, Ardant du Picq discusses the psychological and emotional aspects of warfare, such as courage, fear, and morale. The second part of the book examines the tactics and organization of ancient armies,...