Use of Mines in Trench Warfare (From the French School of St. Cyr)

CONFIDENTIAL
FOR OFFICIAL USE ONLY
NOT TO BE TAKEN INTO FRONT LINE TRENCHES
(From the French School of St. Cyr)
TRANSLATED AND EDITED AT THE ARMY WAR COLLEGE
JULY, 1917
WASHINGTON GOVERNMENT PRINTING OFFICE 1917
WAR DEPARTMENT.
Document No. 635.
Office of The Adjutant General.

WAR DEPARTMENT, Washington, July 23, 1917 .