Second World War remains at Minsmere

By Dr Rob Liddiard (School of History, UEA)

The small hillock that sits above the otherwise flat marshland contains a mixture of medieval and more modern archaeological remains.

Medieval Chapel

The ruined building that can be seen today and which is known as the chapel stands on the original site of Leiston abbey, which was founded by the royal justicier Ranulf de Glanville in 1182 for a community of Premonstratensian canons. This monastery stood on what would have been the estuary of the river Minsmere, but in 1363 severe flooding led to it being abandoned and replaced by a new site inland. This is the present Leiston Abbey, the extensive ruins of which are open to the public. A small monastic presence was maintained on the old site until the dissolution in 1537 and the ruined chapel was built within what had been the earlier abbey church.

The Second World War: Flooding the Marshes

During the Second World War the long beach at Minsmere was seen as vulnerable to a German landing. As a defence measure, the area behind the sand dunes was deliberately flooded to act as a barrier to any enemy who might try to make their way ashore.

The area to the north of the Minsmere river was allowed to flood completely, while the area to the south was only to be flooded when an invasion was imminent. In June 1940 the sea sluice was opened and the door allowing the exit of freshwater from the river closed. When the whole of the north level was flooded, the sea sluice was closed and the area remained inundated until 1945, when the operation of the sluices returned to normal.

The opening of the sluices to flood the Minsmere marshes was undertaken by the Royal Artillery. Despite the national emergency, the young officer standing in the centre of the photo went to ask permission from the local landowner, but when they could not be found, flooded the marsh anyway (Imperial War Museum H11543)

In addition to the flooding of the marshes, the beach was covered with obstacles. Barbed wire, mines, lines of anti-tank blocks, anti-tank scaffolding and ‘Dragon’s Teeth’ – steel spikes set in concrete and intended to rip the bottom out of German landing barges – all formed part of the defences. The drainage channel running parallel to the beach was also widened to form a watery anti-tank ditch.

Minsmere beach c.1949 showing partially dismantled anti-tank scaffolding and ‘Dragon’s Teeth’ waiting to be removed. In the background, the defences and radar station on Dunwich Heath can be seen (Eric Hosking Trust)


As the highest point in the landscape and with a building already offering the potential for camouflage, the hillock was an obvious site for a strongpoint. The medieval walls of the chapel acted as a shell for a rectangular concrete pillbox that was built within the structure and provided with numerous firing points for infantrymen.

The placing of the pillbox here was to guard a minor entry point from the beach and a track that led inland. The men in the pillbox were not left to defend the area on their own, however, as heavy machine guns on Dunwich cliff to the north could sweep the whole beach with fire and field artillery guns placed behind the lines could shell the area in front of the pillbox.

Enemy Action

Standing in flat landscape much of which was covered with water, the chapel site was an obvious target for German planes. During 1940 and 1941 this part of Suffolk was regularly attacked by low flying German aircraft and the pillbox was machine-gunned on 11th May 1941 as part of a longer strafing run by Messcherschmidt 109 aircraft and was reported in some detail by troops on the ground:

At 2140 hrs 3 Me 109s approached WALBERSWICK from the North, two of them at 5,000 ft and one at approx. 250ft. This latter plan machine-gunned WALBERSWICK and then, further down the coast, a ruined chapel near SLUICE, TEA HOUSE, THORPENESS and ALDEBURGH were also subjected to machine-gun fire from this plane. No military casualties but one civilian at ALDEBURGH was injured.

Creating a Habitat

By the end of the war, the area around Minsmere comprised approximately 400 acres of watery pools with extensive reedbeds formed from the network of drainage channels. The wartime flooding of the marshes had, albeit accidentally, created a perfect haven for wild birds. This was the origin of the RSPB Minsmere bird reserve and in the decades that followed careful management has facilitated the development of one of the most significance wildlife habitats in the country.

View of Minsmere marshes c.1949 showing the immediate post-war landscape and the tower of Dunwich Radar Station in the background

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