Napoleonic Defence Heritage on Romney Marsh

In 1803/04 the threat of invasion by the French was extremely real. See  News Item About the Threat of Invasion from The Kentish Gazette 20th July 1804
This page provides information on the defensive measures taken on Romney Marsh against this threat.


Romney Marsh contains an exceptionally significant collection of Napoleonic period fortifications. Notable works of this period include the great programme of Martello Tower building, the construction of the Grand Redoubt at Dymchurch, and the cutting of the Royal Military Canal. 

The closeness of Romney Marsh to the continent, its flat shores and hinterland and easily accessible beaches, has meant that the Marsh has been in the front line whenever invasion has threatened, particularly from across the English Channel. Indeed, invaders from Julius Caesar’s Roman legions, the Anglo-Saxon, the Vikings, and Napoleon’s warships to First World War bombers and Hitler’s planned invasion in 1940, all tried with some succeeding.

The French Revolution of 1789 and the deposition of Louis XVI of France sent shockwaves across the whole of Europe and ultimately saw war spread across Europe and the overseas colonies. Throughout this period Britain was engaged almost continuously in wars with France, ending ultimately with the defeat of Napoleon.

The outbreak of the Revolutionary Wars (1793-1802) and subsequent Napoleonic Wars (1803 – 1815) saw an extensive system of new defenses built in stages across Romney Marsh.
Right Icon Napoleon’s Threatened Invasion of England 1803-1804

Sites of Defences Against Napoleon in 1867
Sites of Defences Against Napoleon in 1867

At the start of this period, Britain was primarily a maritime nation, with only a small standing army. Naval supremacy was Britain’s traditional first line of defence; by controlling the channel and blockading the French fleet in its ports the Admiralty was confident that it could protect Britain from invasion.

In Europe, however, France’s land armies were unstoppable, fighting with revolutionary zeal and making use of new tactics. French military successes on the continent, combined with failed invasion attempts on Ireland in 1796 and 1798 led to a period of invasion fears and ultimately to a massive programme of new defensive works along Britain’s coast. The favourable landing beaches of the Kent Coast and in particular the Romney Marsh embayment and Dungeness became the focus for a new system of strategic defence.


Dymchurch Redoubt
Dymchurch Redoubt


The first phase of ‘Napoleonic period’ defences constructed on the Marsh comprised a series of small coastal batteries and gun platforms supported by earthwork redoubts that were rapidly erected in the early years of the Revolutionary Wars. Subsequently, during the Napoleonic War, a more comprehensive system of layered defence was built, including a string of Martello Towers, Redoubt and the Royal Military Canal.

Right Icon Invasion Coast Walk

Dymchurch Redoubt

Dymchurch Redoubt was built between 1804 and 1812 to support the chain of Martello Towers that stretched along the low-lying coast between Hythe and Rye. The redoubt provided troop accommodation and acted as a command and supply depot for the individual towers. It was also provided with its own guns, providing for 360-degree fire. The redoubt is circular in form; built of brick and granite it comprises a central parade ground enclosed by bombproof magazines and
barracks upon which the gun emplacements were situated. It is encircled by a dry moat.
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Martello Tower No.24 in Dymchurch
Martello Tower No.24 in Dymchurch

Martello Towers

Part of a chain of Martello Towers built along the coast of Kent and Sussex between 1805 and 1808. Towers 22-27 were built in pairs to protect key sluices draining Romney Marsh. Nos 22 & 23 protected the Wallop Sluice; 24 & 25 the Marshland Sluice; and 26 & 27 the Clobsden Gut Sluice.
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Dungeness Batteries and Redoubt

At Dungeness four small coastal batteries were constructed in 1798 so as to protect the offshore anchorage here; two to the west of Dungeness Point and two to the east. These batteries were supported by a redoubt at the point itself, also built in 1798 – together these defences were known as the Dungeness Bastion.

The batteries featured a series of guns arranged in a faceted arc to the seaward side, with a  defensible loopholed wall to the rear. Lade Fort (Dungeness Battery No 2) survives and is a Scheduled Monument. 
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Dungeness Redoubt
Dungeness Redoubt

Royal Military Canal 

The Royal Military Canal was constructed from 1804 around the back of the Romney Marsh and provided a third line of defence (along with Naval control of the Channel and the Coastal Battery and Tower system).

Prior to its construction, the prevailing thought was that the Romney Marsh could be quickly flooded and the resulting flooded morass, ditches and sewers presenting an impassable obstacle for any invading force. In reality, such a proposition was probably unworkable; not only would it need significant forewarning, but the potential harm that would result from any
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Royal Military Canal
Royal Military Canal (Ack. 42)

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