Enemy blow up a mine near Durand Crater at 3 am. Concussion shakes our dugout severely. Crater is 175 yds. long by 50 yds wide. We consolidate.
John Davies PPCLI killed by sniper.
*Large craters were formed when tunnels with a large chamber at the end were dug under the enemy’s lines, packed with explosives and tamped off to contain the explosion. The mines destroyed the defenders and their fortifications, allowing the infantry above to advance over no-man’s land without the usual devastating casualties. The underground war was a strategy of both sides, and tunnellers had to take precautions to avoid those from the other side digging in their direction.