The First World War led not only to enormous social upheavals, but also to a whole series of radical revolutions in military affairs. And the main one was the Great Tank Revolution, which made it possible to overcome the “positional deadlock” of the Western Front. It was in 1914–1918. the tank has turned from a “ridiculous toy” into a new “god of war.” It was on the battlefields of the First World War that a new type of military service and the tactics of its combat use were born. It was here that a colossal breakthrough in tank science was made, which determined the nature of modern warfare for decades. The new book by the leading weapons historian is the most complete study of the period of formation of tank forces, an in-depth analysis of their creation, development and combat use on the fronts of the First World War.