| Royal engineer Tunnelling Companies | |
|---|---|
 | |
| Active | First World War |
| Country |  United Kingdom |
| Branch |  British Army |
| Type | Field corps |
| Garrison/HQ | Saint-Omer/Aldershot |
| Nickname(s) | "The Moles" |
| Engagements | Battle of Hill 60 Battle of Aubers Ridge Battle of Mont Sorrel Battle of the Somme Battle of Messines Battle of Vimy Ridge Battle of Arras (1917) Second Battle of Passchendaele |
| Commanders | |
| Notable commanders | Major John Norton-Griffiths MP |
Royal Engineer tunnelling companies were specialist units of the Corps of Royal Engineers within the British Army formed to dig attacking tunnels under enemy lines during the First World War.
The stalemate situation in the early part of the war led to the deployment of tunnel warfare. After the first German Empire attacks on 21 December 1914, through shallow tunnels underneath no man's land and exploding ten mines under the trenches of the Indian Sirhind Brigade, the British began forming suitable units. In February 1915, eight Tunnelling Companies were created and operational in Flanders from March 1915. By mid-1916, the British Army had around 25,000 trained tunnellers, mostly volunteers taken from coal mining communities. Almost twice that number of "attached infantry" worked permanently alongside the trained miners acting as 'beasts of burden'.[1]
From the spring of 1917 the whole war became more mobile, with grand offensives at Arras, Messines and Passchendaele. There was no longer a place for a tactic that depended upon total stasis for its employment. The tactics and counter-tactics required deeper and deeper tunnelling, hence more time and more stable front lines were also required, so offensive and defensive military mining largely ceased. Underground work continued, with the tunnellers concentrating on deep dugouts for troop accommodation, a tactic used particularly in the Battle of Arras.