
I Corps Troops, Royal Engineers was a battalion-sized unit of Royal Engineers (RE) attached to the British I Corps Headquarters in World War II. It served with the British Expeditionary Force in the Battle of France and Dunkirk evacuation, and later with 21st Army Group during the campaign in North West Europe 1944–45 from D Day until the German surrender at Lüneburg Heath. It later served in British Army of the Rhine.

II Corps Troops, Royal Engineers was a battalion-sized unit of Royal Engineers (RE) attached to the British II Corps Headquarters in World War II. It served with the British Expeditionary Force in the Battle of France and Dunkirk evacuation, and later in Home Defence until disbandment in 1943.

The Orkney Fortress Royal Engineers was a small and short-lived unit of Britain's Territorial Army raised just before World War II to assist in the defence of the Royal Navy base at Scapa Flow in the Orkney Islands.

The Kent Fortress Royal Engineers (KFRE) was a volunteer Territorial unit of the British Army that saw service in both World Wars. They are notable for their successful actions in May 1940, when they destroyed substantial oil stocks and installations just ahead of the German advance, and in August 1944 during the assault crossing of the River Seine.

The East Lancashire Royal Engineers was a Volunteer unit of Britain's Royal Engineers raised in Manchester in 1901. It became the engineer component of the 42nd Division of the Territorial Force, seeing service in Egypt, at Gallipoli and on the Western Front during World War I. In World War II it was in the Dunkirk evacuation with 42nd Division, and then converted to the armoured assault engineer role ('Funnies') in 79th Armoured Division in North West Europe. Its duplicate unit served in Tunisia and Italy. The unit continues today as part of 75 Engineer Regiment in the Army Reserve.

The Tower Hamlets Engineers was a Volunteer unit of the British Royal Engineers (RE) based in East London. Raised in 1868, it provided engineers for two London infantry divisions of the Territorial Force during World War I. In World War II it operated as an RE headquarters, particularly on D-Day and at the Rhine Crossing, while its subordinate companies served in a number of campaigns, including the Siege of Tobruk and with the Chindits. Its successor unit continues to serve in today's Army Reserve.

The 1st Devonshire Engineer Volunteer Corps, later the Devonshire Fortress Royal Engineers, was a volunteer unit of Britain's Royal Engineers whose history dated back to 1862. The unit helped to defend the vital naval base of Plymouth, and supplied detachments for service in the field in both World Wars. During the North African campaign in World War II, the unit's sappers distinguished themselves in bridging the Nile and clearing minefields during and after El Alamein. Their successors served on the postwar Territorial Army until 1969.

VIII Corps Troops, Royal Engineers was a battalion-sized unit of Royal Engineers (RE) attached to the British Army's VIII Corps Headquarters in World War II. It served with 21st Army Group during the campaign in North West Europe 1944–45. It built the first British bridges across the Rhine and the Elbe after the assault crossings in March and April 1945 and continued in British Army of the Rhine after the end of the war.

58 Field Squadron is currently an Explosive Ordnance Disposal (EOD) unit of the Royal Engineers (RE). In its long history its predecessors have fulfilled the roles of artisans, field engineers, chemical warfare specialists, and road builders. They saw active service on the Western Front in World War I and in the Battle of France and Burma Campaign during World War II. On two occasions, the unit's sappers were reputed to have repulsed enemy attacks at the point of the bayonet.

58 Field Squadron is currently an Explosive Ordnance Disposal (EOD) unit of the Royal Engineers (RE). In its long history its predecessors have fulfilled the roles of artisans, field engineers, chemical warfare specialists, and road builders. They saw active service on the Western Front in World War I and in the Battle of France and Burma Campaign during World War II. On two occasions, the unit's sappers were reputed to have repulsed enemy attacks at the point of the bayonet.

58 Field Squadron is currently an Explosive Ordnance Disposal (EOD) unit of the Royal Engineers (RE). In its long history its predecessors have fulfilled the roles of artisans, field engineers, chemical warfare specialists, and road builders. They saw active service on the Western Front in World War I and in the Battle of France and Burma Campaign during World War II. On two occasions, the unit's sappers were reputed to have repulsed enemy attacks at the point of the bayonet.

58 Field Squadron is currently an Explosive Ordnance Disposal (EOD) unit of the Royal Engineers (RE). In its long history its predecessors have fulfilled the roles of artisans, field engineers, chemical warfare specialists, and road builders. They saw active service on the Western Front in World War I and in the Battle of France and Burma Campaign during World War II. On two occasions, the unit's sappers were reputed to have repulsed enemy attacks at the point of the bayonet.

The Kent Fortress Royal Engineers (KFRE) was a volunteer Territorial unit of the British Army that saw service in both World Wars. They are notable for their successful actions in May 1940, when they destroyed substantial oil stocks and installations just ahead of the German advance, and in August 1944 during the assault crossing of the River Seine.

58 Field Squadron is currently an Explosive Ordnance Disposal (EOD) unit of the Royal Engineers (RE). In its long history its predecessors have fulfilled the roles of artisans, field engineers, chemical warfare specialists, and road builders. They saw active service on the Western Front in World War I and in the Battle of France and Burma Campaign during World War II. On two occasions, the unit's sappers were reputed to have repulsed enemy attacks at the point of the bayonet.

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.

Balloons were one of the first mechanisms used in air warfare. Their role was originally mainly for reconnaissance purposes. They provided humans with the first available method of elevating themselves well over the battlefield to obtain the proverbial "birds-eye view." They were an early instrument of definitive intelligence collection, and were also particularly useful in the preparation of accurate battlefield maps, before which time this rudimentary craft had led to many a battlefield failure. Incendiary balloons also have a long history.