Portland Castle: Henry VIII’s Coastal Artillery Fort in England
Site at a Glance
- Rating
- 4.4
- Popularity
- Medium
- Country
- United Kingdom
- Primary era
- Early Modern
- External website
- Open
- Eras represented
- Early Modern
- Civilizations
- English
- Site type
- Military
- Remains
- Fort
On this page17 sections
History
Portland Castle is a coastal artillery fort in the United Kingdom, built for Henry VIII on the Isle of Portland, Dorset, between 1539 and 1541. It was a Henrician fort, a coastal defence built during Henry VIII’s reign, combining artillery positions with accommodation and enclosed defensive spaces. The castle formed part of the king’s Device programme, a network of coastal forts created amid tensions between England, France, and the Holy Roman Empire, then a major central European political entity ruled by Emperor Charles V. Its purpose was to defend against invasion and protect the Portland Roads anchorage, in cooperation with Sandsfoot Castle on the opposite side.
Construction and Tudor defence
Construction began in the summer of 1539 and ended in the spring of 1541, at a cost of approximately £5,000. Lord Russell selected the position after inspecting the anchorage, while Oliver Lawrence acted as royal paymaster. Thomas Mervin became the first captain, commanding four gunners and two other men. In 1545, John Leweston replaced Mervin and also became Lieutenant of Portland. The garrison then increased to 13 men.
A survey made in 1547 and 1548 listed a brass demi-cannon, two brass demi-culverins, four breech-loading portpieces, four slings, eight hagbushes, 23 bows, 29 bills, and 12 pikes. These weapons represented several types of early artillery and firearms, alongside traditional hand weapons. The garrison still consisted of a captain and 13 men in 1596.
Decline, repair, and the Civil War
After peace was declared in 1558, the immediate invasion threat declined and the castle received less attention. Surveys in 1574 and 1583 found it in poor condition. War with Spain later redirected military concern towards south-western England, and £228 was spent on renovation in 1585.
Neglect continued during the early seventeenth century while England remained at peace with France and Spain. A survey of 1623 recorded three culverins, nine demi-culverins, and a saker, but also noted severe sea erosion and the need for extensive repairs. Fourteen years later, the fort had 15 guns and a garrison consisting of a captain and 12 men.
During the English Civil War, Parliamentary forces initially held Portland Castle, but Royalists captured it in 1643 by entering while pretending to be Parliamentary soldiers. Parliament besieged the fort for four months in 1644 and again the following year. The castle surrendered to Vice-Admiral William Batten in April 1646. Its prolonged resistance was difficult to explain because the landward side was relatively vulnerable, although its low position may have made bombardment from the sea difficult.
From the Interregnum to the eighteenth century
During the Interregnum, the period of republican rule between the execution of Charles I in 1649 and the restoration of Charles II in 1660, the castle remained garrisoned and was also used as a prison. In 1651, 103 men were attached to it. The fort defended the Portland Roads during the First Anglo-Dutch War in 1653 and saw action during a three-day naval battle between English and Dutch forces.
After Charles II was restored in 1660, the garrison was reduced to pre-war levels, but the fortifications were repaired because of the continuing Dutch threat. By 1676, the castle had 16 guns. During the eighteenth century, its main role was protecting shipping from privateers, including merchant vessels carrying stone from Portland’s quarries.
Reports in 1702 and 1715 described serious deterioration. The sea had washed away 112 feet, or 34 metres, of the foundations, and the artillery had been reduced to seven guns. By 1779, the caretaker garrison consisted of three men and eight guns, and the fort had reportedly gone 30 years without repair.
Napoleonic and later military use
During the Napoleonic Wars, the armament was increased to six 24-pounder guns, six 12-pounders, and two 9-pounders. The fortification nevertheless remained generally poor in condition. After Napoleon’s final defeat, the castle was disarmed and leased to John Manning, a churchman from Portland, who converted it into a private house. His son, Charles Manning, took it over in 1834 and continued its development.
In the late 1840s, Portland Roads became an artificial harbour after a breakwater was built. New forts appeared on the Verne Heights and along the seafront, but the structure of Portland Castle was left untouched. Following Charles Manning’s death in 1869, the War Office took the castle over again because of renewed fears of invasion. It was used as accommodation for commissioned officers, including the adjutant of the Verne Citadel, a nineteenth-century military fortification on the Verne Heights.
Twentieth-century preservation and public presentation
In 1908, Portland Castle was placed on Schedule C. Under this arrangement, the Army continued to use and manage it while the Office of Works advised on repairs. During the First World War, when Portland Harbour became an important naval base, the castle served as an ordnance store. It became a military residence during the interwar period and was used during the Second World War for accommodation and offices for British and United States personnel, as well as for ordnance storage. A concrete pillbox was built beside it during the war and later demolished.
The War Office transferred the castle to the Ministry of Works in 1949, and it opened to the public in 1955. Most nineteenth- and twentieth-century additions were removed so that the interior could be presented as a sixteenth-century fortress. The Captain’s House and its adjacent gardens continued in another military role, being used by the nearby HMS Osprey naval air station and helicopter facility until 1999. After the base closed, this part of the fort opened to visitors and the house became a visitor facility.
English Heritage manages Portland Castle in the twenty-first century. The main castle is a Grade I listed building and a scheduled monument, designated in 1993 and 1981 respectively. The Captain’s House is listed at Grade II*. Portland Castle is regarded as one of the best-preserved and best-known examples of Henry VIII’s forts. The present Governor’s Garden was created in 2002 by horticulturist Christopher Bradley-Hole as part of a wider English Heritage programme.
Remains
Portland Castle is arranged around a two-storey central keep built of ashlar Portland stone, a pale limestone quarried on the Isle of Portland. The keep is approximately 120 feet, or 37 metres, across and combines a curved central tower, two angular wings, and a forward gun battery. Together these elements create an unusual fan-shaped plan facing the Portland Roads anchorage, Portland Harbour, and Weymouth Harbour. A walled courtyard measuring approximately 170 by 90 feet, or 52 by 27 metres, encloses the keep. Two gun platforms stand on either side, with the Captain’s House on the western side and the Governor’s Garden beyond the eastern wall.
The keep and artillery positions
Great hall and domestic rooms
The ground-floor centre contains an octagonal great hall. Its present large Victorian windows differ from the original arrangement, when the hall provided living space for the garrison. The wings opening from the hall contain the gunners’ quarters and kitchen. The kitchen retains a large sixteenth-century fireplace.
Gun room and battery
The gun room runs around the front of the keep. It was originally a two-storey gun battery, with embrasures, openings in a fortified wall for firing cannon, for five guns on the ground floor and four on the first floor. The southern end of the ground floor was divided into four barrack rooms. Vents in the lower embrasures allowed gun smoke to escape.
The fort was designed for three tiers of artillery, with two tiers in the front battery and a third in the central tower. The wooden roof that formed the first-floor gun platform and the internal wooden partitions have been dismantled, leaving the chamber open to the air. The gun room now contains cannons dating from the eighteenth and nineteenth centuries.
Upper hall and captain’s chamber
The first floor contains an upper hall and the captain’s chamber. In the sixteenth century, the chamber served as the commander’s living and working space. During the nineteenth century, it was converted into a dining room and bedroom. Two bedrooms on the opposite side may originally have been used by the castle’s lieutenant.
Courtyard, entrance, and outer defences
Gateway and courtyard
The castle is entered through an outer gateway on the southern side. The gateway is surmounted by the coat of arms of Charles II. The courtyard is bounded by the enclosing wall and contains the two gun platforms positioned beside the keep. The Captain’s House occupies its western side, while the Governor’s Garden lies beyond the eastern wall.
Moat and later earthwork
A moat formerly protected the keep, together with a drawbridge. The slots for the drawbridge survive. A later moated earthwork measuring 89 by 47 feet, or 27 by 14.4 metres, was built behind the castle to provide additional short-range protection.
Captain’s House and Governor’s Garden
Captain’s House
The Captain’s House developed from an older building beside the main castle that had housed the master gunner. The Manning family converted it into a larger residence. It later served the nearby HMS Osprey base before becoming part of the publicly presented fort.
Governor’s Garden
The Governor’s Garden was created in 2002. Its maritime theme includes circular designs that echo forms in the adjacent castle, and its layout uses local Portland stone.
