WW2 pillbox at Freewarren Bridge near Crofton - geograph

The GHQ Line (General Headquarters Line) was a defence line built in the United Kingdom during

World War II World War II or the Second World War (1 September 1939 – 2 September 1945) was a World war, global conflict between two coalitions: the Allies of World War II, Allies and the Axis powers. World War II by country, Nearly all of the wo ...

to contain an expected German invasion. The

British Army The British Army is the principal Army, land warfare force of the United Kingdom. the British Army comprises 73,847 regular full-time personnel, 4,127 Brigade of Gurkhas, Gurkhas, 25,742 Army Reserve (United Kingdom), volunteer reserve perso ...

had abandoned most of its equipment in

France France, officially the French Republic, is a country located primarily in Western Europe. Overseas France, Its overseas regions and territories include French Guiana in South America, Saint Pierre and Miquelon in the Atlantic Ocean#North Atlan ...

after the

Dunkirk evacuation The Dunkirk evacuation, codenamed Operation Dynamo and also known as the Miracle of Dunkirk, or just Dunkirk, was the evacuation of more than 338,000 Allied soldiers during the Second World War from the beaches and harbour of Dunkirk, in the ...

. It was therefore decided to build a static system of defensive lines around Britain, designed to compartmentalise the country and delay the Germans long enough for more mobile forces to counter-attack. Over 50 defensive lines were constructed across the country. After the coastal defences, the GHQ Line was the longest and most important, designed to protect

London London is the Capital city, capital and List of urban areas in the United Kingdom, largest city of both England and the United Kingdom, with a population of in . London metropolitan area, Its wider metropolitan area is the largest in Wester ...

and the industrial heart of

Britain Britain most often refers to: * Great Britain, a large island comprising the countries of England, Scotland and Wales * The United Kingdom of Great Britain and Northern Ireland, a sovereign state in Europe comprising Great Britain and the north-eas ...

, and was considered to be the last chance of defence. The "green" section of the GHQ Line ran from the northern end of the Taunton Stop Line near Highbridge in

Somerset Somerset ( , ), Archaism, archaically Somersetshire ( , , ) is a Ceremonial counties of England, ceremonial county in South West England. It is bordered by the Bristol Channel, Gloucestershire, and Bristol to the north, Wiltshire to the east ...

, along the

River Brue The River Brue originates in the parish of Brewham in Somerset, England, and reaches the sea some west at Burnham-on-Sea. It originally took a different route from Glastonbury to the sea, but this was changed by Glastonbury Abbey in the twelfth ...

, across the Mendips from Wells and following the railway from Masbury into the Wellow valley. This joined the "blue" line which followed the

Kennet and Avon Canal The Kennet and Avon Canal is a waterway in southern England with an overall length of , made up of two lengths of Navigability, navigable river linked by a canal. The name is used to refer to the entire length of the navigation rather than sol ...

Reading Reading is the process of taking in the sense or meaning of symbols, often specifically those of a written language, by means of Visual perception, sight or Somatosensory system, touch. For educators and researchers, reading is a multifacete ...

. The green line continued from

Bradford-on-Avon Bradford-on-Avon (sometimes Bradford on Avon) is a town and civil parishes in England, civil parish in west Wiltshire (district), Wiltshire, England, near the border with Somerset. The town's canal, historic buildings, shops, pubs and restauran ...

along the river to

Malmesbury Malmesbury () is a town and civil parish in north Wiltshire, England, which lies approximately west of Swindon, northeast of Bristol, and north of Chippenham. The older part of the town is on a hilltop which is almost surrounded by the upp ...

where it met the "red" line which ran to Abingdon, along the

Thames The River Thames ( ), known alternatively in parts as the River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the second-longest in the United Kingdom, after th ...

Pangbourne Pangbourne is a village and civil parish on the River Thames in the West Berkshire unitary area of the county of Berkshire, England. Pangbourne has shops, churches, schools and a village hall. Outside its nucleated village, grouped developed are ...

and rejoined the blue line at Theale. The green line continued to Avening then down the valley to

Framilode Framilode is a village on the banks of the River Severn in Gloucestershire, England, in the parish of Fretherne with Saul. It consists of two settlements: the larger, Framilode, is at the mouth of the River Frome, Stroud, River Frome. The sma ...

, protecting the strategic areas of

Bristol Bristol () is a City status in the United Kingdom, cathedral city, unitary authority area and ceremonial county in South West England, the most populous city in the region. Built around the River Avon, Bristol, River Avon, it is bordered by t ...

Avonmouth Avonmouth ( ) is a port and outer suburb of Bristol, England, on the north bank of the mouth of the River Avon and the eastern shore of the Severn Estuary. Part of the Port of Bristol, Avonmouth Docks is important to the region's maritime eco ...

, and Sharpness. The eastern line was to run inland of the coast from

Essex Essex ( ) is a Ceremonial counties of England, ceremonial county in the East of England, and one of the home counties. It is bordered by Cambridgeshire and Suffolk to the north, the North Sea to the east, Kent across the Thames Estuary to the ...

Edinburgh Edinburgh is the capital city of Scotland and one of its 32 Council areas of Scotland, council areas. The city is located in southeast Scotland and is bounded to the north by the Firth of Forth and to the south by the Pentland Hills. Edinburgh ...

but was not completed. London was protected by the concentric rings of the Outer London Defence Ring. On the section of the line in Essex, between Great Chesterford and

Canvey Island Canvey Island is a town, civil parish and reclaimed island in the Thames Estuary, near Southend-on-Sea, in the Castle Point district, in the county of Essex, England. It has an area of and a population of 38,170.Office for National Statistics. ...

, the defences were made up of around 400 FW3 type concrete pillboxes, which were part of the

British hardened field defences of World War II British hardened field defences of World War II were small fortified structures constructed as a part of British anti-invasion preparations of World War II, British anti-invasion preparations. They were popularly known as ''Pillbox (military), ...

. Well over 100 pillboxes still exist on this section in 2025, with around 40 highly visible FW3 Type 22, 24, 26, 27 and 28 boxes between the Rettendon Turnpike and Howe Green, mostly alongside the A130 road. Many more FW3s are still in place north of

Chelmsford Chelmsford () is a city in the City of Chelmsford district in the county of Essex, England. It is the county town of Essex and one of three cities in the county, along with Colchester and Southend-on-Sea. It is located north-east of London ...

along the Chelmer Valley and towards

Great Dunmow Great Dunmow is a historic market town and civil parish in the Uttlesford district of Essex, England. It lies to the north of the A120 road, approximately midway between Bishop's Stortford and Braintree, Essex, Braintree, east of London Stanste ...

References

External links

{{commons category
UK World War 2 Invasion Defences

The Defence of Britain Project

A blog post featuring a map of the line
British World War II defensive lines Fortifications of London London in World War II

See also

References

External links