This chapter explores some of the major strategic questions faced by Callwell as Director of Military Operations, including the German colonies, Salonika and Mesopotamia. It also assesses his views of other important issues with which he was concerned, such as munitions, manpower and the army’s relations with the press. The chapter looks at his time as an ‘odd-job’ man for the War Office (1916-18), during which he was engaged in various interesting (and not unimportant) roles. Finally, it examines his later works, especially his autobiographical and biographical work. Most infamous is his study of Sir Henry Wilson, a highly controversial work.