The First World War broke out in 1914, and with that, General Evert was appointed to command the 10th Army. And he briefly participated in the East Prussian Campaign, but after several days, he was replaced by Lieutenant-General Vasily Flug, and he later replaced the aged General Zaltsa, after which he took part in the Invasion of Galicia and the battle at Vistula River. In mid August 1915, Evert later replaced army chief of staff General Mikhail Alekseyev as the commander-in-chief of the Western Front, he was also made adjutant-general later in December of that year. From May to June, Evert and his army fought the Austro-German forces at Opatov and Lublin. And in September, his forces successfully repelled the Austro-German breakthrough between the cities of Smorgon and Dvinsk, for this success, he was awarded the Order of St. George of the 3rd degree in early October.