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The Royal Military Canal stretches for 28 miles hugging the old cliff line that borders the Romney Marsh from Hythe in the north east to Cliff End in the south west. It was built as a third line of defence against Napoleon, after the British Royal Navy patrolling the English Channel and the line of 74 Martello Towers built along the south coast. The Royal Military Canal was constructed in two sections. The longest section starts at Hythe in Kent 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 Brede.

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The River Brede rises north of Battle and flows generally eastwards before joining the River Tillingham and then the River Rother at Rye. It is approximately 15 miles long. In its lower course it forms part of the Royal Military Canal. In the past the river had a wide estuary, on which stood the town of Winchelsea, but this has silted up.