Square Leg

File:Square leg.gif

'Square Leg' target plot

Square Leg was a British government home defence Command Post and field exercise which was held from 11 to 25 September 1980<ref>Template:Cite book</ref> and which tested the Transition to War and Home Defence roles of the Ministry of Defence and British government. Part of the exercise involved a mock nuclear attack on Britain; the exercise scenario of 150<ref name=southyorks1>Template:Cite book Cited in {{#invoke:citation/CS1|citation |CitationClass=web }}</ref> nuclear weapons striking Britain, with "almost all" of these weapons having a yield ranging from 500 kilotons to 3 megatons<ref name=":2">Template:Cite magazine</ref> and a resulting total yield of 280.5 megatons,<ref name=southyorks1 /> was felt to be reasonably realistic, but the post-exercise report stated that a total strike in excess of 1,000 megatons would be likely. An increased ratio of ground bursts to air bursts was depicted to provide all the regional NBC cells with radioactive fallout challenges,<ref name=":1">The National Archives, HO 322/950</ref> with underwater bursts also being depicted.<ref name=southyorks2>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> Furthermore, the scenario was altered from official assessments as these were highly classified and many participants did not have the appropriate clearance to see them.<ref name=":1" />

Partial<ref name=bombplot>Template:Cite book</ref> bomb plots were released for England and Wales<ref name=":2" /> and for Scotland,<ref>Template:Cite magazine</ref> but not for Northern Ireland.<ref>Template:Cite magazine</ref> While official casualty figures were not provided, Stan Openshaw and Philip Steadman produced an independent estimate of 29 million deaths (53 percent of the population) and 7 million seriously injuried (12 percent), with short-term survivors numbering 19 million (35 percent).Template:Refn<ref name=bombplot />

Square Leg was criticised for a number of reasons: the weapons used were exclusively in the high-yield megaton range, with an average of 1.5 Mt per bomb, but a realistic attack based on known Soviet capabilities would have seen mixed weapons yields, including many missile-based warheads in the low-hundred-kiloton range. Also, no targets in Inner London were attacked (for example, Whitehall, the centre of British government), though collateral damage from strikes on Outer London targets and on Potters Bar and OngarTemplate:Refn meant that much of the Inner London area was still destroyed;<ref name=":2" /><ref name=":3">Template:Cite magazine</ref> towns such as Eastbourne were hit for no obvious reason.Template:Refn<ref>Doomsday, Britain after Nuclear Attack, p. 105</ref> All government and military bunkers were assumed to have survived for exercise purposes, although Kelvedon Hatch Sub-Regional Headquarters had difficulty in establishing regional control.<ref name=":1" /> The United Kingdom Warning and Monitoring Organisation was not a "live" participant, with the strike data it would have provided instead being pre-recorded and played into the exercise as it proceeded, an aspect that was criticised by participants after the exercise.<ref name=":1" />

The Lothian Regional Council refused to participate in Square Leg,<ref name=":3" /> and the exercise came under journalistic scrutiny after its details were leaked to the press,<ref name=":3" /><ref>Template:Cite magazine</ref> but otherwise, despite providing a "major boost" to the nuclear disarmament movement,<ref>Template:Cite book</ref> it was not met with significant opposition in the way that the later Hard Rock exercise would be.

Timeline of main events and civil and armed forces actions

Transition to War

The following table shows the hypothetical pre-strike event list drawn from the national Main Event List for Square Leg, testing the Transition to War stage.<ref>Template:Cite book</ref>

Date	Event
January 1980	Warsaw Pact, which has recently come under new leadership, holds military exercises similar to those usually held in the summer. While Pact forces would normally return to base after end of exercise, on this occasion they remain close to NATO's frontier.<ref name=subterraneattw>Template:Cite magazine</ref>
April - August 1980	Soviet Union demands that Norway and Denmark withdraw from NATO, sparking diplomatic tension that continues into August. Public reaction is calm as the situation is believed to be just another deterioration in East-West relations.<ref name=subterraneattw />
By early August 1980	NATO commanders declare a state of vigilance in anticipation of war. Reserve forces are mobilised and civil defence planning is initiated at a covert level. "A very few senior key personnel" man SRHQs while County and District authorities begin attack preparations. UKWMO is briefed and begins its own preparations. Planning is not publicly admitted to at this stage in order to avoid public alarm and in order not to precipitate an attack (it is still hoped that a diplomatic solution can be reached).<ref name=subterraneattw />
Prior to and including 15 August	Planning becomes more overt in the continued absence of a diplomatic solution. Major urban centres clear their hospitals of patients and all but a few staff members in order to make way for anticipated casualties, prompting protests from patients and their families, and from local authorities who find themselves facing increased pressure on care home places.<ref name=subterraneattw /> Cabinet instructs all departments and specified authorities to review their plans for Transition to War.<ref name=:0>Template:Cite book</ref> SRHQs and local authority emergency centres are fully prepared.<ref name=subterraneattw />
16 August	Fuel rationing imposed,<ref name=:0 /> leading to queues at petrol stations and police needing to be drafted in to prevent hoarding.<ref name=subterraneattw />
27 August	Government requests preparations to be made to remove art treasures.<ref name=:0 /><ref name=subterraneattw />
31 August	Industrial unrest and large-scale activity by extreme left- and right-wing parties.<ref name=:0 /> Resentment is directed at the heavier than usual police presence and the police's role in controlling subversives and potential subversives. Multiple arrests made under emergency powers. Arson attacks on industrial sites, supermarkets, etc. Police require military assistance to quell some of the unrest; they manage to do so without shots being fired.<ref name=subterraneattw />
1 September	Considerable cross-Channel movement into the UK by expatriate families on a self-evacuation basis.<ref name=:0 /><ref name=subterraneattw />
7 September	Prime Minister addresses nation via TV and radio.<ref name=:0 /><ref name=subterraneattw />
9 September	Secretary of State authorises power of direction over British Airways<ref name=:0 /> and national shipping.<ref name=subterraneattw />
11 September	Prime Minister again addresses nation.<ref name=:0 /><ref name=subterraneattw />
12 September	Protect and Survive instructions, which were already available at libraries and HMSO in pamphlet form,<ref name=subterraneattw /> are issued through the media.<ref name=:0 /> Those who intend to follow instructions begin doing so.<ref name=subterraneattw /> Cabinet approves Queen's Order 2,<ref name=:0 /> effectively dissolving Parliament and granting emergency powers to the government.<ref name=subterraneattw /> Directed food buying (by government departments, police, and military services, etc.),<ref name=:0 /> accompanied by panic buying breaking out in some areas and subsequent price rises.<ref name=subterraneattw /> Noticeable rundown of industry.<ref name=:0 /> Key pointsTemplate:Refn placed under guard. Essential Service Routes designated and closed off to the general public; few local authorities have dedicated plans, with others either repurposing existing plans or acting in a completely improvised manner. Between ten and thirty per cent of persons in perceived target areas ignore advice to stay at home and instead self-evacuate, causing further difficulties for local authorities who are under no obligation to assist such evacuees (though some do).<ref name=subterraneattw /> Local authorities, MPs, police, and the services swamped with offers of help in forming some sort of civil defence/Home Guard organisation.<ref name=:0 /> Local authority attitudes vary; many turn down offers of civilian help despite government encouragement to use such help, while some others take on civilians with relevant skills in order to make up for staff desertions.<ref name=subterraneattw />
13 September	Prime Minister speaks to nation for a third time.<ref name=:0 /><ref name=subterraneattw /> Panic food buying continues.<ref name=:0 />
15 September	General Alert and war declared. Fighting breaks out on continent. Conventional bombing on defence related targets in UK. Public reaction to bombing is mixed - those living in high-rise flats and in areas generally thought to be obvious targets leave home quickly. Industry seriously affected. Schools close in afternoon.<ref name=:0 /><ref name=subterraneattw />
17 September	Fighting on continent escalates.<ref name=subterraneattw /> Government authorises local authorities to staff their wartime headquarters. Public passenger transport operating at fifty per cent of capacity. Government orders manning of headquarters in the Regions.<ref name=:0 /><ref name=subterraneattw />
19 September	Satellites and RAF Fylingdales detect incoming nuclear attack.<ref name=subterraneattw /> Attack Warning Red 11.55 am. Nuclear strike starts at 12.01 pm<ref name=:0 /> and ends at 12.10 pm.<ref name=":2" /> Strike mainly hits military and communications targets, though civilian areas are also targeted.<ref name=subterraneattw /> Loss of RAF Fylingdales and other communication difficulties caused by the first strike mean that no warning can be provided when a second strike begins.<ref name=subterraneattw /> This strike starts at 13.00 and sporadically "drift[s] in" until 15.00,<ref name=":2" /> and targets population centres and industrial sites along with some repeat strikes on first wave targets.<ref name=subterraneattw />

Survival

The following table of Square Leg's 'survival' period, detailing the events that occurred in the first two weeks following the attack, is extracted from the Warwickshire County War Diary.<ref>Template:Cite book</ref>

Date	Event
20 September	Daily food requirements - 680,700 rations. Eighteen thousand people (in refugee camps) suffering third-degree burns. Isolated reports of refugees leaving West Midlands area.
22 September	Casualty aid points swamped. Hospitals and improvised hospitals full. Decision taken to conserve police strength with a view to deployment of Police Support Units later.
23 September	Commence mass advice to achieve public order. Reappraise triage. Request medical aid from military.
24 September	Establish additional casualty aid points close to existing where possible. Commit to home nursing casualties who will probably die. Commence grave-digging operations. (Transport) Remove dead from casualty aid points; remove dead from damaged areas as radiation levels permit. Fire situation in county under control.
25 September	Identify rationing levels of food and water. Identify additional rationing requirements of workers. Flow of refugees from the West Midlands is indicated; 31,000 to North Warwickshire, 12,000 to South Warwickshire.
27 September	Casualty figures Rugby area is indicated 30,000 plus estimate, Nuneaton area 17,000 plus. Large numbers of persons suffering first stages of radiation sickness. Arrange for establishment of decontamination units. Consider variations to law - liaise with police.
28 September	Estimate 100,000 plus refugees coming from West Midlands - most injured/shocked/irradiated. Consider disinfection in Rugby/Coventry area to avert disease. Liaise with military for aircraft for spraying. Control of refugees in the west of the county impossible at this date. (Via Wartime Broadcasting System) advise public on measures being taken to alleviate rioting and looting. Produce advice to encourage 'Good Neighbourly' behaviour towards refugees. Advise public with regard to disposal of dead bodies. Advise populace not to leave their areas.
29 September	Numbers increasing at casualty aid points, priority being given to savable under-thirties. Anticipate refugee figures to be 200,000 plus. Further requests to Sub-Regional HQ for additional food; SRHQ directive received - conserve food.
30 September	Arrange collection of food from Buffer Depots. Liaise with police and military for convoy guards. Food to be held and guarded in district stores. Deaths becoming a serious problem, liaise with transport and works for speedier removal of bodies from casualty aid points. Advise public on action to be taken re looting - particularly theft of food. Call for volunteers to assist with transport and works tasks.
1 October	Notification from SRHQ; twenty-five per cent of food requirements for refugees to come from local Buffer Depots. Police Support Units established and deployed to areas where refugees are known to be located. Consider establishment of interim police controls in known trouble areas.
2 October	Feeding to commence at 1800 hrs. Calorific content of meals will be six hundred + one pint of water (non-workers), 800 + two pints of water (workers). Meals provided for infant feeding totally inadequate, request additional supplies. Known casualty figures 37,000; seriously injured 67,000. Radiation sickness entering third stage. Disease control absolute priority. All Essential Service Routes cleared. Identify and prepare additional burial resources. Advise public on location and times Feeding Centres will be open, safe routes to them (and) emphasize subsistence level of feeding in operation.

Police and military tasks during this and the Recovery period were set out as follows:<ref>Template:Cite book</ref>

• "Maintenance of law and order - greatest problem [in] urban areas"
• "Control of selfish and disgruntled minorities"
• "Support and protect special courts"
• "Execution of sentences" (military only)
• "Key points protection and reinforcement"
• "Protection of convoys"
• "Guards for controls"
• "Personal protection for VIPs"
• "Subjugation and elimination of hostile elements"
• "Control of weapons"
• "Bomb disposal" (military only)
• "Supervision and control of operations involving the use of explosives, e.g. demolitions"
• "Guards on internment areas"
• "Assisting in control at communal feeding centres"
• "Enforcement of controls to prevent the spread of disease"
• "Manning any pre-planned pattern of military stations and posts"
• "Maintenance and control of Essential Service Routes"
• "Control of movement"
• Tasks regarding the training of new personnel "to compensate for wastage"
• Reconnaissance tasks
• Advisory tasks

Recovery

The 'recovery' period reports are drawn from the Gloucestershire County War Diary's log of requests for military support.<ref>Template:Cite book</ref>

Date	Request to military staff	Response
3 October	Request for air reconnaissance at Little Rissington food depot.	No response.
	Provide armed troops to assist police at ten locations on M5 Motorway.	Thirty men deployed.
	Provide coils of barbed wire.	Barbed wire requested.
	Provide armed troops to assist troops at Gloucester to: (a) quell disturbance involving eight thousand persons. (b) guard a food warehouse at Hare Lane.	(a) Twenty-five troops sent. (b) Twenty-five troops despatched (sic).
	Provide ambulances, trained first aid personnel and medical supplies.	No ambulances, trained first aid personnel or medical supplies available. Some vehicles and drivers only.
	Provide armed troops to assist police with law and order problems at Cirencester, Cinderford, Lydney and Newnham.	Thirty armed men made available for Cirencester. Due to radiation hazard, (it is) not considered effective to send armed parties into other areas at this time.
	Provide armed guards to secure [Ministry of Agriculture, Fisheries and Food] warehouse.	County Military HQ requested [Armed Forces HQ] 7Template:Refn to provide assistance from east of county due to radiation levels.
4 October	Provide assistance to police at Gloucester to deal with law and order problem.	Fifteen men from Hare Lane detailed for this task.
	Secure and guard a food warehouse at Cirencester.	Twenty armed men despatched (sic) from Innsworth at 0930 hrs.
	Provide guards at twelve food supply and cooking centres throughout the country (sic, most likely meant to be county instead). Provide escorts on ten food supply vehicles.	Five armed guards provided at each location. Two armed guards provided for each vehicle.
	Assist police to prevent hostile crowd gaining access to Gloucester District Wartime HQ.	Twenty armed men made available.
	Assist police at GCHQ (Government Communications Headquarters in Cheltenham) which is under attack by looters and refugees.	Two mechanized platoons despatched (sic) at 1400 hrs.
	Accommodate five thousand homeless at RAF Innsworth.	Cannot accommodate at RAF Innsworth but could take four thousand two hundred at RAF Quedgely (sic). Vehicles available at Aschurch (sic), but no drivers or fuel.
	Provide hygiene and sanitation teams and equipment at Cheltenham. Provide rodenticides and disinfectants.	Unable to assist.
	Provide security patrols and barbed wire at Special Rest Centre at Stroud for suspected disease-carrying refugees.	Two platoons despatched (sic) to Stroud. No stocks of barbed wire available.
	Provide assistance to Ministry of Agriculture officers who have been prevented by hostile crowd from arranging the despatch (sic) of food from a market garden.	1630hrs. Wessex helicopter and twelve soldiers sent to scene.

See also

• Nuclear weapons and the United Kingdom
• World War III
• The Warsaw Pact operation Seven Days to the River Rhine
• RAF Greenham Common airfield
• United Kingdom Warning and Monitoring Organisation

References

• Doomsday, Britain after Nuclear Attack, Stan Openshaw, Philip Steadman and Owen Greene, Basil Blackwell, 1983 Template:ISBN
• War Plan UK, Duncan Campbell, Template:ISBN
• The National Archives, FCO 46/2446 to 46/2448, HO 322/950