D-Day 80

Eighty years on from the launch of Operation Neptune on 6 June 1944, the largest seaborne invasion in history, we take a look at those craft which, for one reason or another, did not make it to the landing beaches of Normandy, but which do form part of a tangible heritage of D-Day around the southern coasts of England.

An invasion of this scale required considerable preparations, in assembling the fleet, in meeting the conditions they were likely to find geographically and militarily, and in meeting the needs of the invasion forces once the assault on Normandy began in earnest.

A key problem for the invasion forces was the issue of landing supplies in a hostile environment until French ports could be recaptured from the occupying forces. To overcome this problem, the ‘Mulberry Harbours’ were prefabricated concrete units to be towed across the Channel and assembled at Omaha and Gold, two of the five designated landing beaches. ‘Phoenix’ caissons were built to be sunk in great secrecy off the southern coasts of England to be refloated and towed across once the invasion was under way to build the Mulberry Harbours, supported by subsidiary units such as ‘Whale’ pontoons.

Not all of the Phoenix caissons could be refloated to serve their purpose, and a number of these survive at the spot they were sunk 80 years ago. They are charted in southern English waters from the Bristol Channel in the west via the English Channel facing the Normandy coast to the Thames Estuary in the east. The remains of these Phoenix units form a counterpart to the remains of the ‘as built’ Mulberry Harbours on the opposite side of the Channel. (The Portland caissons shown at the top of the blog are slightly different, in that they came back as part of a return group post-war.)

The invasion began during the night of 5-6 June. LCT(A) 2428 was a Mk V Landing Craft Tank (Armoured), which, as the description implies, was intended to carry tanks which could roll off directly onto the beach to provide covering firepower. This function would itself attract fierce return fire, so to that end the vessel was fitted with protective armour plating, hence the (Armoured) suffix.

LCT(A) 2428 was laden with Centaur CS IV tanks and Caterpillar D7 armoured bulldozers as she began to make her way over to Normandy. In the early evening of 5 June she broke down and anchored near the Nab Tower, to the east of the Isle of Wight. The vessel began to capsize following damage ‘sustained by weather to double bottoms on starboard side aft’ according to a military report, and shed her lading, although fortunately without loss of life. However, she remained afloat after capsizing, posing a navigational hazard, and the only remedy was to sink her by gunfire.

LCT(A) 2428 therefore lies some distance from her cargo of tanks and bulldozers, which now lie as an assemblage off Selsey Bill, Sussex – two wreck sites from one event. The remains of the tanks and bulldozers form a Scheduled Monument: read more about the scheduled site and discover more about the Landing Craft 2428 project.

An operation at the scale of Neptune required air cover and air support. The wooden Horsa glider, a personnel carrier which could be towed to deploy troops by air, came into its own in seaborne invasions on D-Day and in other theatres of war. Like the Landing Craft Tanks, some of the gliders moved off for their own specific operations on the night of 5 June 1944, while others took to the air during D-Day itself.

Among them was Horsa Mk I LH550, bound for Landing Zone N at Ranville, Normandy, which slipped tow for reasons unknown, and ditched into the sea off Worthing, West Sussex, apparently without loss of life. Unlike the Mulberry remains or LCT(A) 2428 and her cargo, the last resting place of Horsa LH550 is unknown.

Convoy ETM-1, comprising American Liberty ships, sent to Britain under the Lend-Lease programme, and their escorts, left the Thames Estuary on the morning of D-Day en route to Normandy. The convoy moved south towards the Straits of Dover when one of their number, the Sambut, was struck by fire from German positions at Cap Gris Nez. War matériel by its very nature is usually hazardous, and cargo vessels laden with such dangerous cargoes extremely vulnerable. Sambut‘s cargo of petrol cans and vehicles caught fire, which led to an explosion of the gelignite she also carried, and it was impossible to save the ship, her crucial supplies, or, unfortunately, a quarter of the personnel on board. (Read our D-Day 70 blog for more detail on the loss of Sambut.) The loss of Sambut was captured on film in real time by another ship in the same convoy, and the reminiscences of a survivor of the 92nd Light Anti-Aircraft Regiment of the Royal Artillery who was on board, recorded 50 years after the event, are also in the collections of the Imperial War Museum (Reel 2, 05:50 onwards). It is a well-documented wreck and is known and charted.

In the breadth and diversity of the craft that were lost on 6 June 1944 within English waters – aircraft, land vehicles, cargo ships and floating harbour structures – we glimpse a little of the scale of the invasion. We recognise, too, the archaeological remains of a single day in history on this side of the Channel, linked to their counterparts lost the same day on the Normandy beaches, memorials in concrete, wood, and steel.