This account is primarily intended for officers studying the 1915 campaign and considers the battles in relation to the Field Service Regulations to which there are many references. It is the result of a very great deal of study and also of personal experience on the Western front. It comprises appreciations of the situation at various dates, diaries of events and narratives of battles. It analyses results and critically examines planning, preparation and conduct of the battles. Reasons for our failure at Aubers Ridge and for the more encouraging results at Festubert are clearly brought out, and a series of points are made explaining the further failure at Loos.