Abstract: This article is dedicated to the history of the Russian Orthodox Church during the revolutionary disturbances of 1917 and the Russian Civil War. The subject of this research is the the history of military clergy of the Kolchak Army. The article introduced into the scientific discourse the report of the dean of the 4th Orenburg Army Corps of the Southern Army of the Armed Forces of Admiral A. V. Kolchak –  archpriest Stefan Vasilyevich Kaverznev on the activity of military clergy of the corps in August – September of 1919. This is a valuable historical source that contains records on staff composition of regimental priests of the 4th Orenburg Army Corps, as well as reveals the engagement of military priests in propaganda activity among the soldiers and officers of the corps. The report of the archpriest S. V. Kaverznev provides valuable information on the history of military operations of the 4th Orenburg Army Corps in summer of 1919, which ended with its defeat and escape to the Turgai Steppe. The article also publishes the formal request of the archpriest S. V. Kaverznev on the emergency situation that took place in the 4th Orenburg Army Corps – desertion of the regimental priest of the 6th Syzran Rifle Regiment Vasily Yaremenko, who joined the Reds in early September of 1919. The author believes that this document testifies to the escalated symptoms that led to decomposition of the Kolchak Army in the autumn of 1919.