Brusilov Offensive
With the start of World War I, Diterikhs was assigned as Chief of Staff for the Russian Third Army on the Southwestern Front under the command of General Aleksei Brusilov, with whom he assisted in planning the Brusilov Offensive in August 1916. In September of the same year, he commanded a Russian expeditionary force in Thessaloniki on the Macedonian front in support of the Serbian Army.