Sapping
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Sapping is a term used in siege operations to describe the digging of a covered trench to approach a besieged place without danger from the enemy's fire. The purpose of the sap is usually to advance a
Union troops of the 1st New York Engineers digging a sap with a sap roller on Morris Island, 1863
The star-shaped Fort Bourtange, restored to its 1750 condition, is an example of a trace italienne fort.
183rd Tunnelling Company
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The 183rd Tunnelling Company was one of the tunnelling companies of the Royal Engineers created by the British Army during World War I. The tunnelling units were occupied in offensive and defensive mi
Geological cross-section of the Somme battlefield
Miners laying charges for one of the mines on the Somme, 1–13 July 1916.