In this assessment of German tactics on the Western Front during the Great War, Wynne argues that the German tactical success was largely attributed to "the work of one mastermind," that of General Fritz von Lossberg. Written in 1939 much use is made of the then recently published memories of von Lossberg. Surveying all the major operations in France and Flanders from Neuve Chapelle in March 1915 to the end of Passchendaele in 1917, this is a classic written by a very skilled Great War historian.