At on July 1916 the Battle of the Somme started with explosion of 17 massive 'mines' underneath enemy territory. Lochnagar was the largest of these. It remains "The largest crater ever made by man 'in anger'".
Image of soldiers leaving their trench to advance on the enemy. Notice that bayonets were always pointed outward because soldiers had to be prepared to encage in close combat the moment they left their trench.