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

by Army War College

USE OF MINES.

In sectors where the distance between the two lines is below 150 meters, mine warfare must be used. When the trenches are farther apart, underground warfare is seldom employed. In special cases, however, when there are strong ventilators and the line is stable enough to permit of it, advance may be made underground.