Siracourt V-1 bunker

With the Allies gaining air superiority by 1943, different sections of the Luftwaffe – which had responsibility for the V-1 – debated how best the weapons could be deployed in the face of an increased threat of aerial bombardment. The Luftwaffe's Flak division favoured dispersing V-1s to a large number of small camouflaged launch sites. However, General Erhard Milch, who was in charge of the Luftwaffe's production programme, advocated large launch bunkers. Adolf Hitler was known to be in favour of such an approach, which had already led to the construction of a massive bunker at Watten for launching V-2 missiles. In July 1943, Luftwaffe chief Hermann Göring brokered a compromise under which both alternatives would be pursued; four (and ultimately ten) heavy launch bunkers would be built along with 96 light installations. The heavy bunkers were all intended to be built to a standard design, codenamed Wasserwerk (waterworks) to conceal their true purpose. The first two would be built in the Pas-de-Calais at Desvres near Lottinghen and Siracourt near Saint-Pol-sur-Ternoise. The two sites are about and from London respectively. Two more would be built at Tamerville and at Couville on the Cotentin Peninsula near Cherbourg. It was intended that all four would be operational by December 1943, with further bunkers to be built subsequently. == Design and construction ==

The Siracourt bunker is about long, wide and high, built using some 55,000 m³ of steel-reinforced concrete. Its design and method of construction took into account the lessons learned from the destruction in August 1943 of the Watten bunker while it was still under construction. The German engineers adopted a new method which they called Verbunkerung, which involved first building the roof flat on the ground then excavating beneath it – sheltered from bombs – to create the rest of the facility. and an aperture from which they would have been launched. Although Allied reconstructions imagined a single launch ramp, it is possible that the Germans intended to install two parallel ramps to increase the rate at which V-1s could be fired. It is also possible that, as early as November 1943, the Luftwaffe decided to continue the construction works at Siracourt and other Wasserwerk sites to deceive Allied intelligence into believing that the sites were still under active construction and to use the four Wasserwerk sites as ‘bomber baits’. == Discovery and destruction ==

The Allies spotted the construction of the Siracourt bunker almost as soon as it began in September 1943, when two parallel trenches were dug and concreted to form the walls of the structure. These bombs considerably change the terrain around the site, destroying most of the village of Siracourt. After the war, the authorities quickly abandoned the idea of demolishing the bunker. Before the land was leveled, 80 German prisoners of war removed the launching ramp facing England and partially filled in the interior of the bunker. The Siracourt bunker is still extant today and is visible from the road. It is located on private land. == Air raids on the Siracourt site ==