Siracourt V-1 bunker

The Siracourt V-1 bunker is a Second World War bunker built in 1943-44 by the forces of Nazi Germany at Siracourt, a commune in the Pas-de-Calais department in the Nord-Pas-de-Calais region of France. Codenamed Wasserwerk St. Pol (Waterworks St. Pol), it was intended for use as a bomb-proof storage facility and launch site for V-1 flying bombs. However it never went into operation due to intensive Allied bombing that made it the most heavily attacked of all the German V-weapon sites.

Part of Nazi Germany
Located in the Canton of Saint-Pol-sur-Ternoise, France
Remains of Siracourt V-1 storage and launch depot
Siracourt is located in France
Coordinates50°22′27″N 2°16′05″E / 50.37424°N 2.26810°E
Height10 metres (33 ft)
Site information
OwnerPrivately owned
Open to
the public
Site history
Built byOrganisation Todt
In usecaptured before being used
Battles/warsOperation Crossbow, Operation Aphrodite


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.[1]

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 177 kilometres (110 mi) and 210 kilometres (130 mi) from London respectively. Two more would be built 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.[1]

Design and construction

The Siracourt bunker is about 215 metres (705 ft) long, 36 metres (118 ft) wide and 10 metres (33 ft) 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.[1] It was constructed on high ground about a kilometer (three-quarters of a mile) north of the Hesdin-Saint Pol road, to the north of the original site of the village of Siracourt. The bunker was built in loamy soil some 7.5 metres (25 ft) deep, resting on a layer of chalk bedrock.[2] 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.[1]

The bunker would have been linked with the main railway line from Saint Pol to Abbeville, enabling trains carrying V-1s and supplies to enter the body of the structure. It was, in effect, a fortified railway tunnel with a storage area capable of housing 150 missiles[3] 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.[1]

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.[2] Heavy Allied bombing hindered construction but it continued until the end of June 1944, when the site was wrecked by Tallboy bombs dropped by the Royal Air Force. By this time about 90 per cent of the concrete had been completed, apart from the end sections, but the supposedly bomb-proof structure proved unable to withstand the six-ton Tallboy. One bomb fully penetrated the roof and exploded underneath, while another caused substantial damage when it exploded next to one of the walls. The ground around the site was churned up by over 5,000 tons of bombs.[1] By the time the site was abandoned in April 1944, the exterior had practically been completed but the excavation of the interior had only just begun.[2]

The Siracourt bunker is still extant today and is visible from the road. It is located on private land.[4]

Air raids on the Siracourt site

Bombing of Siracourt in World War II
Date Result
January 31, 1944 Mission 203: 74 of 74 B-24's hit V-weapon site construction at St. Pol/Siracourt, France; 2 aircraft are damaged beyond repair; no losses. The B-24's are escorted by 114 P-47's)[5]
February 2, 1944 Mission 205: 95 of 110 B-24s hit V-weapon construction sites at St Pol/Siracourt and Watten, France; 2 B-24s are lost, 1 is damaged beyond repair and 2 damaged; casualties are 10 KIA and 19 MIA. 183 P-47s escort the B-24s without loss.[5]
February 6, 1944 Mission 212: 150 B-24s are dispatched to St Pol/Siracourt V-weapon site but 37 hit Chateaudun Airfield[5] [1] [2] [3]
February 8, 1944 Mission 214: 53 of 54 B-24s hit the V-weapon site at Siracourt[5]
February 11, 1944 Mission 218: 94 of 201 B-24s, including the HEAVEN CAN WAIT II of the 68th Squadron,[4] bomb the Siracourt V-weapon site in France with PFF equipment[5]
February 12, 1944 Mission 220: 97 of 99 B-24s hit the V-weapon site at St Pol/Siracourt, France; 29 B-24s are damaged (the HEAVEN CAN WAIT II crash-landed);[5] no losses or casualties; escort is provided by 84 Eighth and Ninth Air Force P-47's and 41 P-51s; no claims, losses or casualties.[5]
February 13, 1944 Mission 221 included the 453rd Bombardment Group[5] [6]
February 15, 1944 [7] Mission 223: 52 of 54 B-24s hit V-weapon sites at St Pol/Siracourt, France; 29 B-24s are damaged; no losses or casualties.[5]
March 12, 1944 [8] Mission 256: 46 of 52 B-24s dispatched hit a V-weapon site at St Pol/Siracourt, France and 6 hit targets of opportunity, all using blind-bombing techniques; 1 B-24 is lost and 26 damaged; casualties are 1 WIA.[5]
April 5, 1944 Mission 288: 21 of 50 B-24s dispatched hit V-weapon sites at St Pol/Siracourt, France without loss; heavy clouds and the failure of blind-bombing equipment cause other B-24s to return to base without bombing. 50 P-47s escort the B-24s without loss.[5] [9]
April 20, 1944 Mission 309 included the 466th Bombardment Group [10]
April 22, 1944 B-17 42-95928 Shot down by flak on a mission to Siracourt V-1 launch site. MACR#4093.[11]
April 27, 1944 Mission 322 included the 466th Bombardment Group [12]
April 30, 1944 Mission 329: 52 of 55 B-24s bomb V-weapon sites at Siracourt; 3 B-24s are damaged; 1 airman is WIA. Escort is provided by 128 P-38s, 268 P-47s and 248 Eighth and Ninth Air Force P-51s[5] [13]
May 1, 1944 A mission included the 401st Bombardment Group [14]
May 2, 1944 Mission 335 included the 453rd Bombardment Group[5] [15]
May 6, 1944 Mission 340: 168 bombers and 185 fighters are dispatched to hit NOBALL (V-weapon) targets in France; 90 B-17s dispatched to the Pas de Calais area return to base with bombs due to cloud cover over the target; 70 of 78 B-24s hit Siracourt; 48 B-17s are damaged. Escort is provided by 57 Ninth Air Force P-38s, 47 P-47s and 81 P-51s without loss.[5]
May 15, 1944 [16] Mission 356: 166 bombers and 104 fighters hit V-weapon sites in France with 1 fighter lost; 38 of 58 B-17s bomb Marquise/Mimoyecques with 5 B-17s damaged; 90 of 108 B-24s bomb Siracourt with 8 B-24s damaged; escort is provided by 104 P-51s with 1 lost (pilot is MIA).[5] One B-24 received a direct hit by an AAA shell.[6] At least one aircraft aborted.[7] [17]
May 21, 1944 Mission 360: 150 bombers and 48 fighters hit V-weapon sites in France without loss; 25 of 40 B-17s hit Marquise/Mimoyecques and 13 B-17s are damaged; 99 of 110 B-24s hit Siracourt and 1 B-24 is damaged. Escort is provided by 48 P-47s without loss.[5] At least one aircraft aborted.[7] [18]
May 22, 1944 [19] Mission 361: 94 of 96 B-24s hit V-weapon sites at Siracourt, France; 1 B-24 is damaged. Escort is provided by 145 P-38s, 95 P-47s and 328 P-51s; P-38s claim 8-1-5 Luftwaffe aircraft, P-47s claim 12-1-2 and P-51s claim 2-2-1; 3 P-38s, 3 P-47s and a P-51 are lost; 1 P-38 and 2 P-47s are damaged beyond repair; 1 P-38, 2 P-47s and a P-51 are damaged; 6 pilots are MIA.[5]
May 30, 1944 Mission 380 included the 447th Bombardment Group[5] [20]
June 21, 1944 [21] Mission 429: In the late afternoon, 31 B-24s bomb CROSSBOW (V-weapon) supply sites at Oisemont/Neuville and Saint-Martin-L'Hortier and 39 bomb a rocket site at Siracourt, France. AA fire shoots down 1 B-24; escort is provided by 99 P-47s, meeting no enemy aircraft, but 1 group strafes railroad and canal targets.[5]
June 22, 1944 234 aircraft - 119 Lancasters, 102 Halifaxes, 13 Mosquitos - of Nos 1, 4, 5 and 8 Groups to special V-weapon sites and stores. The sites at Mimoyecques and Siracourt were accurately bombed by 1 and No 4 Group forces with Pathfinder marking but the No 617 Squadron force attacking Wizernes failed to find its target because of cloud and returned without dropping its bombs. 1 Halifax lost from the Siracourt raid.[8] [22] [23]
June 25, 1944 [24] 323 aircraft - 202 Halifaxes, 106 Lancasters, 15 Mosquitos - of Nos 1, 4, 6 and No 8 Group attacked 3 flying bomb sites. The weather was clear and it was believed that all 3 raids were accurate. 2 Halifaxes of No 4 Group were lost from the raid on the Montorgueil site. No 617 Squadron sent 17 Lancasters, 2 Mosquitos and 1 Mustang to bomb the Siracourt flying-bomb store.[8]
June 29, 1944 286 Lancasters and 19 Mosquitos of Nos 1, 5 and 8 Groups attacked 2 flying-bomb launching sites and a store. There was partial cloud cover over all the targets; some bombing was accurate but some was scattered. 5 aircraft - 3 Lancasters and 2 Mosquitos - lost, including the aircraft of the Master Bomber on the raid to the Siracourt site.[8]
July 6, 1944 551 aircraft - 314 Halifaxes, 210 Lancasters, 26 Mosquitos, 1 Mustang (Group-Captain Leonard Cheshire's marker aircraft)[9] - attacked 5 V-weapon targets. Only 1 aircraft was lost, a No 6 Group Halifax from an on siracourt flying-bomb store. Four of the targets were clear of cloud and were believed to have been bombed accurately but no results were seen at the Forêt de Croc launching site.[8] Three Tallboy bomb hits are claimed, but the postwar Sanders Report indicates no direct hits.[9]
August 1, 1944 No. 617 Squadron RAF [25]
August 4, 1944 Mission 515: The first Operation Aphrodite mission is flown using 4 radio-controlled war weary B-17s as flying bombs. The B-17G 42-39835 Wantta Spa[10] pilot was killed, and the Siracourt drone had control problems and crashed in a wood at Sudbourne.[11]

References and notes

  1. ^ a b c d e f Zaloga, Johnson & Taylor 2008, p. 20
  2. ^ a b c Sanders 1945, p. 1
  3. ^ Zaloga & Laurier 2005, p. 14
  4. ^ Zaloga, Johnson & Taylor 2008, p. 61
  5. ^ a b c d e f g h i j k l m n o p q r "8th Air Force 1944 Chronicles". Archived from the original on 2007-09-12. Retrieved 2007-05-25. 1944: January, February, June, July Archived 2008-03-03 at, August Archived 2007-12-14 at, September
  6. ^ Bastien, Charles R (1976). 32 Copilots. p. 56. ISBN 978-1-4120-1729-9. 858th Squadron (North Pickenham) Engineer-Gunner Louis A Dezarlo, B-24J 44-40167:
    "I was flying the left waist gun position. We received a direct hit (I think an 88). It went through Sonner's seat, through Sonner and out the roof. Fortunately, it was a dud. Lou D'Auino (Radioman) was standing behind Sonner's seat with his elbow resting on the seat back and the round singed his sleeve on the way out. Sonner was flying the plane at the time and he slumped forward causing us to lose several thousand feet of altitude as well as the rest of the Group. He never knew what hit him. It took several crew members to pry him out of his seat.
  7. ^ a b "Hadden Crew 608". U S Army Air Force /2nd Air Division /492nd Bomb Group (Heavy). Retrieved 2008-02-27.
  8. ^ a b c d "Campaign Diary". Royal Air Force Bomber Command 60th Anniversary. UK Crown. Retrieved 2007-05-24. 1944: June Archived 2007-06-11 at the Wayback Machine, July Archived 2007-07-06 at the UK Government Web Archive, August Archived 2007-06-07 at the Wayback Machine
  9. ^ a b "The V-Weapons". After The Battle. 1974. p. 14. Archived from the original on March 12, 2009.
  10. ^ "Aphrodite-Missions, Aircraft and Crews". B-17 Flying Fortresses: Queen of the Skies. Jing Zhou. Retrieved 2008-02-06.
  11. ^ "USAAF Serial Numbers". Encyclopedia of American Aircraft. Joseph F. Baugher. Archived from 42-39758 to 42-50026 the original Check |url= value (help) on 2009-04-04. Retrieved 2008-02-06.
    • NOTE: Since pilots were to abandon the aircraft after transfer of control to the mothership (not impact), the August 4 claim for the Siracourt target appears inaccurate: "pilot killed when abandoned aircraft too soon before impact."


  • Sanders, Terence R.B. (1945). Investigation of the "Heavy" Crossbow installations in Northern France. Report by the Sanders Mission to the Chairman of the Crossbow Committee: Appendix D. 1.
  • Zaloga, Steven J.; Johnson, Hugh; Taylor, Chris (2008). German V-Weapon Sites 1943-45. Osprey Publishing. ISBN 978-1-84603-247-9.
  • Zaloga, Steven J.; Laurier, Jim (2005). V-1 Flying Bomb 1942-52: Hitler's Infamous 'Doodlebug'. Osprey publishing. ISBN 978-1-84176-791-8.

Further reading

External links

Boeing B-17 Flying Fortress

The Boeing B-17 Flying Fortress is a four-engined heavy bomber developed in the 1930s for the United States Army Air Corps (USAAC). Competing against Douglas and Martin for a contract to build 200 bombers, the Boeing entry (prototype Model 299/XB-17) outperformed both competitors and exceeded the air corps' performance specifications. Although Boeing lost the contract (to the Douglas B-18 Bolo) because the prototype crashed, the air corps ordered 13 more B-17s for further evaluation. From its introduction in 1938, the B-17 Flying Fortress evolved through numerous design advances, becoming the third-most produced bomber of all time, behind the four-engined B-24 and the multirole, twin-engined Ju 88.

The B-17 was primarily employed by the USAAF in the daylight strategic bombing campaign of World War II against German industrial and military targets. The United States Eighth Air Force, based at many airfields in central, eastern and southern England, and the Fifteenth Air Force, based in Italy, complemented the RAF Bomber Command's nighttime area bombing in the Combined Bomber Offensive to help secure air superiority over the cities, factories and battlefields of Western Europe in preparation for the invasion of France in 1944. The B-17 also participated to a lesser extent in the War in the Pacific, early in World War II, where it conducted raids against Japanese shipping and airfields.From its prewar inception, the USAAC (by June 1941, the USAAF) promoted the aircraft as a strategic weapon; it was a relatively fast, high-flying, long-range bomber with heavy defensive armament at the expense of bombload. It developed a reputation for toughness based upon stories and photos of badly damaged B-17s safely returning to base. The B-17 dropped more bombs than any other U.S. aircraft in World War II. Of approximately 1.5 million tons of bombs dropped on Nazi Germany and its occupied territories by U.S. aircraft, over 640,000 tons were dropped from B-17s. In addition to its role as a bomber, the B-17 was also employed as a transport, antisubmarine aircraft, drone controller, and search-and-rescue aircraft.

As of October 2019, 9 aircraft remain airworthy, though none of them were ever flown in combat. Dozens more are in storage or on static display. The oldest of these is a D-series flown in combat in the Pacific and the Caribbean.

Operation Aphrodite

Aphrodite and Anvil were the World War II code names of United States Army Air Forces and United States Navy operations to use B-17 and PB4Y bombers as precision-guided munitions against bunkers and other hardened/reinforced enemy facilities, such as those targeted during Operation Crossbow.The plan called for B-17 aircraft that had been taken out of operational service (various nicknames existed such as "robot", "baby", "drone" or "weary Willy") to be loaded to capacity with explosives, and flown by radio control into bomb-resistant fortifications such as German U-boat pens and V-weapon sites.

It was hoped that it would match the British success with Tallboy and Grand Slam ground penetration bombs but the project was dangerous, expensive and unsuccessful. Of 14 missions flown, none resulted in the successful destruction of a target. Many aircraft lost control and crashed or were shot down by flak, and many pilots were killed. However, a handful of aircraft scored near misses. One notable pilot death was that of Lt Joseph P. Kennedy, Jr., USNR, the elder brother of future US President John F. Kennedy.

The program effectively ceased on January 27, 1945 when General Spaatz sent an urgent message to Doolittle: "Aphrodite babies must not be launched against the enemy until further orders".


Siracourt is a commune in the Pas-de-Calais department in the Hauts-de-France region of France.

Supermarine Spitfire operational history

The Supermarine Spitfire, the only British fighter to be manufactured before, during and after the Second World War, was designed as a short-range fighter capable of defending Britain from bomber attack and achieved legendary status fulfilling this role during the Battle of Britain. According to fighter ace J.E. "Johnnie" Johnson it was the best conventional defensive fighter of the war.The fighter evolved into a multi-role aircraft capable of operating in different environments. For example, the Spitfire was a pioneer in the role of the unarmed, photo reconnaissance (P.R.) aircraft that relied on high speed and high altitude to avoid detection and attack.Post-war the Spitfire was to continue to serve as a front line fighter and in secondary roles for several air forces well into the 1950s. The last offensive sorties made by RAF Spitfires were flown by 60 Squadron Mk XVIIIs over Malaya on 1 January 1951.

Tallboy (bomb)

Tallboy, or Bomb, Medium Capacity, 12,000 lb, was an earthquake bomb developed by the British aeronautical engineer Barnes Wallis and used by the RAF during the Second World War.

At 5 long tons (5.1 t), it could only be carried by the Avro Lancaster heavy bomber. It proved to be effective against massive and hardened structures against which conventional bombing had proved ineffective.

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