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Royal Military Canal

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The Royal Military Canal is a canal running for 28 miles (45 km) between Seabrook near Folkestone and Cliff End near Hastings, following the old cliff line bordering Romney Marsh, which was constructed as a defence against the possible invasion of England during the Napoleonic Wars.

The canal was conceived by Lieutenant-Colonel John Brown of the Royal Staff Corps of field engineers in 1804, during anti-invasion preparations, as defensible barrier to ensure that a French force could not use the Romney Marsh as a bridgehead. It had previously been assumed that the marsh could be inundated in the event of an invasion, but Brown argued that this would take ten days to implement and would cause massive disruption in the event of a false alarm. At a meeting on 26 September 1804, the Prime Minister, William Pitt the Younger, and the Commander-in-Chief of the Forces, the Duke of York, both enthusiastically endorsed the scheme. John Rennie was appointed consultant engineer, and Pitt personally persuaded the local landowners to agree to the new canal.

Construction was started at Seabrook, near Hythe in Kent on 30 October 1804. By May 1805 only six miles of the canal had been completed; William Pitt intervened and the contractors and Rennie were dismissed. The work was resumed by the Quartermaster-General’s department with Lt-Col. Brown in command. Civilian navvies dug the canal itself, while soldiers built the ramparts; up to 1,500 men were employed in the project. It was constructed in two sections: the longer section starts at Hythe and ends at Iden Lock in East Sussex; the second, smaller section, runs from the foot of Winchelsea Hill to Cliff End. Both sections are linked by the Rivers Rother and River Brede. Artillery batteries were generally located every 500 yards (460 m), where the canal was staggered to create a salient, allowing the guns to enfilade the next stretch of water.

A military road was built on the inland side of the canal, and crossings consisted of moveable wooden bridges. Any troops stationed or moving along the military road would have been protected by the earthen bank of the parapet, which was piled up with excavated soil. The canal was completed in April 1809 at a total cost of £234,000; it was hoped that tolls for use of the waterway and road would help to defray the cost. In addition to these works, a number of Martello Towers were built to protect the vulnerable sluices that controlled the water level in the canal, being Towers Number 22 to 27 and 30, three of them are still standing.

Despite the fact that the canal never saw military action, it was used to try to control smuggling from Romney Marsh. Guard houses were constructed at each bridge along its length. This met with limited success because of corrupt guards. Although a barge service was established from Hythe to Rye, the canal was abandoned in 1877 and leased to the Lords of the Level of Romney Marsh.

During the early stages of World War II, during preparations for a threatened German invasion, the canal was manned by 31st Independent Brigade Group, who fortified each salient with a concrete pillbox and barbed wire entanglements; numerous pillboxes survive today.[5] In the German invasion plan, codenamed Operation Sea Lion, the paratroopers of the 7th Flieger-Division were tasked with a parachute landing to secure crossing points across the Royal Military Canal on the first day of the invasion.

There is a public footpath running the entire length of the canal. The path makes an excellent long distance walk and is part of the longer 262km Saxon Shore Way. Aside from being historically significant in its own right, the path passes by numerous WW2 pillboxes and unusual acoustic mirrors, the historic cinque port towns of Hythe, Winchelsea and Rye, the 12th century St Rumwold's church, as well as Lympne and Camber castles. The walk is generally flat and can be broken evenly into two sections of 22km with Ham Street in the centre.

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