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The Auxiliary Units or GHQ Auxiliary Units were specially trained, highly secret units created by the United Kingdom government during the Second World War, with the aim using irregular warfare to help combat any invasion of the United Kingdom by Nazi Germany, which the Germans codenamed Operation Sea Lion. With the advantage of having witnessed the rapid fall of several continental nations, the United Kingdom was the only country during the war that was able to create a multi-layered guerrilla and resistance movement in anticipation of an invasion. The Auxiliary Units would fight as uniformed guerrillas during the military campaign, but were not themselves a resistance organisation. If defeated, then resistance units organised by SIS (MI6) would continue the struggle. Service in the Auxiliary Units was expected to be highly dangerous, with a projected life expectancy of just 12 days for its members; along with orders to either shoot each other or use explosives to kill themselves if capture by an enemy force seemed likely.
Urged on by the War Office, Prime Minister Winston Churchill initiated the Auxiliary Units in the early summer of 1940. This was to counter the civilian Home Defence Scheme already established by SIS (MI6), but outside War Office control. The Auxiliary Units answered to GHQ Home Forces, but were organised as if part of the local Home Guard.
Churchill appointed Colonel Colin Gubbins to found the Auxiliary Units. Gubbins, a regular British Army soldier, had acquired considerable experience and expertise in guerrilla warfare during the Allied intervention in the Russian Civil War in 1919 and in the Anglo-Irish War of 1919–1921. Most recently, he had returned from Norway, where he headed the Independent Companies, the predecessors of the British Commandos. In November 1940 Gubbins moved to the Special Operations Executive (SOE).
In modern times, various sources may incorrectly refer to the Auxiliary Units as the "British Resistance Organisation". This is a title that was never used by the organization, neither officially or unofficially, as the Auxiliary Units were organized under the auspices of the Home Guard as a special unit- not as a resistance movement. Auxiliary Unit troops would function as Home Guard soldiers, wearing Home Guard uniforms, but practice guerilla warfare and irregular warfare tactics, while answering to governmentally-appointed leaders and/or officers. This is in contrast to a resistance movement, especially those formed in WWII, who typically wore no uniform and typically answered to their own chain of command.
Gubbins used several officers who had served with the Independent Companies in Norway, plus others he had known there. Units were localised on a county structure, as they would probably be fragmented and isolated from each other. They were distributed around the coast rather than being country-wide, with priority being given to the counties most at risk from enemy invasion, the two most vulnerable being Kent and Sussex in south east England. The two best known officers from this period were Captain Peter Fleming of the Grenadier Guards and Captain Mike Calvert of the Royal Engineers.
Calvert had recently served in the 5th Battalion, Scots Guards, which had been formed to fight as a ski-troop in Finland. Both of these men were too valuable to stay long, once the immediate threat of invasion was over.
Operational Patrols consisted of between four and eight men, often farmers or landowners. They were usually recruited from the most able members of the Home Guard, possessed excellent local knowledge and were able to live off the land. Gamekeepers and even poachers were particularly valued.  They were always intended to fight in Home Guard uniform and from 1942 the men were badged to Home Guard battalions 201 (Scotland), 202 (northern England), or 203 (southern England).[dubious ]
Each Patrol was a self-contained cell, expected to be self-sufficient and operationally autonomous in the case of invasion, generally operating within a 15-mile radius. They were provided with a concealed underground Operational Base (OB), usually built by the Royal Engineers in a local woodland, with a camouflaged entrance and emergency escape tunnel. It is thought that 400 to 500 such OBs were constructed.
Some Patrols had an additional concealed Observation Post and/or underground ammunition store. Patrols were provided with a selection of the latest weapons including a silenced pistol or Sten gun and Fairbairn-Sykes "commando" knives, quantities of plastic explosive, incendiary devices, and food to last for two weeks. Members anticipated being shot if they were captured, and were expected to shoot themselves first rather than be taken alive.
A 2011 Cranfield University PhD on the Home Guard by Dale Clarke has a chapter on the weapons and explosives used by them, includes several pictures of knives in particular.
The mission of the units was to attack invading forces from behind their own lines while conventional forces fell back to the last-ditch GHQ Line. Aircraft, fuel dumps, railway lines, and depots were high on the list of targets, as were senior German officers. Patrols secretly reconnoitred local country houses, which might be used by German officers, in preparation.
Special Duty Sections and Signals
Separate from the Auxiliary Units' Operational Patrols was the Special Duty Branch, originally recruited by SIS and carefully vetted and selected from the local civilian population. This group acted as "eyes and ears" and would report back to military intelligence any information they heard from 'careless talk' or from watching troop movements and supply routes. It was supported by a signals network of hidden, short-range, wireless sets around the coast. The structure allowed no means of passing on such information to the Operational Patrols. It is unlikely that the wireless network would survive long after invasion and it was therefore unable to link the isolated Operational Patrols into a national network that could act in concert, on behalf of a British government in exile and its representatives still in the United Kingdom. Instead, SIS (MI6) created a separate resistance organisation (Section VII) with powerful wireless sets that was intended to act on a longer-term basis.
The Special Duties Sections were largely recruited from the civilian population, with around 4,000 members. They had been trained to identify vehicles, high-ranking officers and military units, and were to gather intelligence and leave reports in dead letter drops. The reports would be collected by runners and taken to one of over 200 secret radio transmitters operated by trained civilian signals staff. The civilian personnel operated as 'Intelligence Gatherers' and operated the OUT Station radios. ATS subalterns or Royal Signals personnel operated the Special Duties IN-Stations and Zero Stations.
The Auxiliary Units were kept in being long after any immediate Nazi threat had passed and were stood down only in November 1944. Several Auxiliary Unit members later joined the Special Air Service. Many men saw action in the campaign in France in late 1944, notably in Operation Houndsworth and Operation Bulbasket.
Dale Clarke in his PhD lists the explosives found when five posts in Essex were finally handed over[clarification needed] in 1964. He concludes the British railway network was a prime target:
- 14,738 rounds of ammunition for pistols, rifles and submachine guns, including a quantity of incendiary rounds
- 1,205 lbs of gelignite, of Nobel 808 and of plastic explosive, most of it in a safe enough condition to take away
- 3,742 ft delayed action fuse
- 930 ft instantaneous safety fuse
- 250 ft detonating cord
- 1,447 time pencils
- 1,207 L-delay switches (a later form of time pencil which, instead of relying on acid, is triggered by induced metal fatigue)
- 1,271 detonators of various types
- 719 push, pull and pressure-release booby trap switches
- 314 paraffin bombs and 340 igniters for these bombs and for the safety fuses
- 131 fog signals
- 121 smoke bombs
- 212 thunderflashes
- 571 primers
- 36 1-lb slabs of gun cotton
- 4 hand grenades
- 10 phosphorus grenades
- 33 time pencils with booby trap switches attached to made-up charges
From 1942, the Operational Patrols of the Auxiliary Units tried to re-invent themselves as an anti-raiding force. This was primarily a device to avoid them being disbanded as the War Office had made a promise that the volunteers would not be returned to normal Home Guard duties. They therefore had to be kept in existence until the general stand-down of the Home Guard. Nonetheless, some units were deployed to the Isle of Wight prior to the D day landings in 1944, in order to help protect the Pluto fuel pipeline from being attacked by German commandos. It was then suggested that the Auxiliary Units should be fully administered by the Home Guard but this was not enacted before the final stand-down in November 1944.
The Auxiliary Units were finally given the recognition they deserved in 2012 when they officially took part in the march past at the Cenotaph in London.
An Auxiliary Unit arms cache features in the 1985 BBC TV series, Blott on the Landscape.
British partisans feature in two UK films that imagine what would have happened if Germany had successfully invaded Britain: the 1966 film It Happened Here (which simply refers to 'partisans') and the 2011 film Resistance based on Owen Sheers' first novel, Resistance. The partisans in the latter are loosely based upon Auxiliary Units, albeit with considerable artistic licence..
The Auxiliary Units feature in the BBC programme Wartime Farm although there is some confusion between the roles of the Operational Patrols and the Special Duties Branch.
- British military history of World War II
- British anti-invasion preparations of World War II
- British military history
- Special forces
- Rab Butler
- Axis victory in World War II, a list of Nazi Germany/Axis/World War II alternate history articles
- Coleshill Auxiliary Research Team
- Atkin, Malcolm (2015). Fighting Nazi Occupation: British Resistance 1939 - 1945. Barnsley: Pen and Sword. ISBN 978-1-47383-377-7.
- Atkin, Malcolm (2015). "British Resistance in WW2: Organisation".
- Hardman, Robert (2011-11-25). "The British Resistance: The true story of the secret guerilla army of shopkeepers and farmworkers trained to defy the Nazis in a suicidal last stand". Daily Mail (UK: DMG Media). Archived from the original on 2015-11-21. Retrieved 2016-01-29.
Not only were Auxiliary Units given a life expectancy of 12 days, but they were also under orders not to be captured. If surrounded, they would need to shoot each other or blow themselves up with their own explosives.
- Sykes, Tom (28 March 2016). "British Resistance Archive". British Resistance Archive. Coleshill Auxiliary Research Team. Retrieved 28 March 2016.
- Lampe (2007), p.113
- "The History of the Auxiliary Units & British Resistance Movement". Cole's Hill House. Retrieved 2016-01-29.
- "Trevor Miners, Auxilier -obituary". Daily Telegraph. 8 April 2016. Retrieved 9 April 2016.
- Clarke, D. M. (December 2010). Arming the British Home Guard, 1940-1944 (PDF) (Thesis). Cranfield University. Retrieved 13 June 2015.
- "Special Duties Section". The British Resistance Archive. 2015. Retrieved 13 June 2015.
- Atkin, Malcolm (2015). Fighting Nazi Occupation: British Resistance 1939 - 1945. Pen and Sword. p. 158. ISBN 978-1-47383-377-7.
- "Trevor Miners (obituary)". The Times (71890). 21 April 2016. p. 56.
- Watson, Bill (2011) . Gone To Ground. Coleshill Auxiliary Research Team (Foreword by David Blair). ISBN 1-908374-06-3.
- Lampe, David (2007) . The Last Ditch: Britain's Resistance Plans Against the Nazis. Greenhill Books (Foreword by Gary Sheffield). ISBN 1-85367-730-2.
- Ward, Arthur (1997). Resisting the Nazi Invader. Constable. ISBN 0-09-476750-5.
- Stewart Angell. The Secret Sussex Resistance. (Middleton Press) ISBN 1-873793-82-0
- Roger Ford. Fire from the Forest (Orion, 2004), ISBN 0-304-36336-7
- Donald Brown. Somerset versus Hitler (Countryside Books, 2001) ISBN 1-85306-590-0
- Warwicker, John (2002). With Britain in Mortal Danger: Britain's Most Secret Army of WWII. Cerberus. ISBN 1-84145-112-6.
- Warwicker, John (2008). Churchill's Underground Army: A History of the Auxiliary Units in World War II. Frontline Books. ISBN 1-84832-515-0.
- Sheers, Owen (2008). Resistance. Faber and Faber. ISBN 0-571-22964-6.
- Atkin, Malcolm (2015). Fighting Nazi Occupation: British Resistance 1939-1945. Barnsley: Pen and Sword. ISBN 978-1-47383-377-7.
- "British Resistance Archive". The Coleshill Auxiliary Research Team. 2016.
- "British Resistance in WW2". Malcolm Atkin (2015).
- Atkin, Malcolm (2016). "Myth and Reality: the Auxiliary Units of the Second World War". Academia.edu.
- "Record of the Auxiliary Units 1940-1944". web.archive.org. 2007. Archived from the original on 21 June 2007.
- Ward, Arthur (2007). "Britain's Guerrillas". web.archive.org. Archived from the original on 21 June 2007.
- "Museum of the British Resistance Organization". Parham Airfield Museum. 2013.
- "UK Pillbox, Pillboxes, Bunkers, Anti-tank traps and other Anti-Invasion Defences built in World War 2". pillboxesuk.co.uk. 2014.
- "Hurstpierpoint Patrol (Auxiliary Units)". Subterranea Britannica.
- Sampson, David (2013). "Stuart Macrae's "Toy Box"". The Mills Grenade Collectors Site.
- Leet, Geoff (2008). "The Caithness Secret Army in World War II". web.archive.org. Archived from the original on 20 July 2008.