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ImageThe war of 1914-1918 relied on engineering. Without engineers there would have been no supply to the armies, because the RE's maintained the railways, roads, water supply, bridges and transport. There would have been no communications, because the RE's maintained the telephones, wireless and other signalling equipment. There would have been little cover for the infantry and no positions for the artillery, because the RE's designed and built the front-line fortifications. And finally, without the RE's the infantry and artillery would have soon been powerless, as they maintained the guns and other weapons. Little wonder that the Royal Engineers grew into a large and complex organisation.
Manpower: how big was the RE?
On 1 August 1914, the RE consisted of 1056 officers and 10394 men of the regular army and Special Reserve, plus another 513 and 13127 respectively serving with the RE of the Territorial Force. By the same date in 1917, it had grown to a total manpower of 295668. In other words, it was twelve times bigger than the peacetime establishment.
Pre-war
The officers and men mentioned above manned 26 coastal defence Fortress Companies (of which 15 were overseas); 15 Field Companies (2); 7 Signal Companies (1); 3 Survey Companies, 2 Railway Companies; 2 Cable and Airline (signalling) Companies and miscellaneous other units. There were also 9 Depot companies carrying out training and administrative duties and various Schools. The detailed sections below describe how these numbers and types of unit expanded during the war.
Fortress Companies
Click here for details of the Fortress Companies
Field and Signals Companies
The most numerous of the Engineers units, the Field and Signals Companies provided the technical expertise at the front-lines. Click here for details of the units and here for details of their composition.
Field Survey Units
Click here for details of the Field Survey Units
Special Companies
Formed following Germany's first strike using poison gas, at the Second Battle of Ypres, the RE Special Companies were chemical warfare engineers.
Tunnelling Companies
As war on the Western Front assumed siege conditions, mining operations began and the Royal Engineers organised specialist tunnelling units.
Railway Companies
There were Railway Operating Companies and Light Railway Companies
Inland Waterways and Docks Companies
The specialist arm of the IW&D constructed and operated operated docks and waterways at home and overseas
Other RE units
Click here for miscellaneous other units of the Royal Engineers