The Royal Corps of Signals is one of the combat support arms of the British Army. Signals units are among the first into action, providing the battlefield communications and information systems essential to all operations. Royal Signals units provide the full telecommunications infrastructure for the Army wherever they operate in the world. The Corps has its own engineers, logistics experts and systems operators to run radio and area networks in the field. It is responsible for installing, maintaining and operating all types of telecommunications equipment and information systems, providing command support to commanders and their headquarters, and conducting electronic warfare against enemy communications.

Telegraph troops are responsible for the establishment of their own side’s telegraphic communications in war and for the disruption of the enemy’s telegraphic communications. The telegraph troops created in Prussia in 1830 within the New Prussian engineer battalions were established as a separate corps in 1899, which subsequently became the Signal Corps of the Wehrmacht and Waffen SS. Its modern successors are the signal troops and electronic warfare troops. Its predecessors used various optical telegraphic systems.