Operation Jericho

During 1943 Allied and German interest in the Pas de Calais increased; the Allies wanted information about the Atlantic Wall defences against an invasion, to keep as much of the Westheer as possible away from Normandy and operations Bodyline and Crossbow against V-weapons sites appearing in the region.[1][lower-alpha 2] The Germans wanted to keep preparations for the Allied invasion and the V-1 flying bomb reprisal offensive as secret as possible. Oberst Hermann Giskes, head of Abwehr (German military intelligence) in the Low Countries, Belgium and Northern France and controller of the Englandspiel (1942–1944) counter-intelligence operation. Lucien Pieri, a shopkeeper in Amiens, had run a profitable sideline as a Gestapo informer since 1941 and by 1943 had a network of informers which penetrated many of the resistance (La Résistance) networks in northern France. The Gestapo and Abwehr was able to expose many French, British and US espionage and sabotage networks in northern and north-west France.[2]

Contemporary map showing V-1 launch sites, 1944

In late October 1943, the capture of the résistant Roland Farjon, a senior figure in Organisation civile et militaire (OCM), began a period of mass arrests of résistants from OCM, which claimed a membership of 100,000 men and women, including about 12,000 in A region (Amiens), Alliance, Sosies and other groups in preparation for a possible Allied invasion. Prisoners of the Gestapo winter offensive of 1943–1944, taken around Amiens were imprisoned at the local gaol where, in December 1943, twelve résistants were shot.[3] On 14 February 1944, Raymond Vivant, the sous-préfet of Abbeville and the last OCM leader to remain at liberty was arrested. Vivant had assembled a system earlier in the war by which people gleaned information on the defences of the Channel coast and passed it to village mayors, who delivered it to Vivant for onward transmission to London by wireless. With the loss of so many resistance leaders, had Vivant come to know far too much about the invasion and how the resistance was expected to support it, which included a plan to reorganise the resistance and to expand it tenfold.[4]

The loss of Vivant brought OCM and other networks to the brink of collapse; the information was smuggled out of Amiens gaol and transmitted to England causing much alarm in OSS and MI6. News also arrived that two American spies and one British were in Amiens prison, two apparently recent arrivals in France. A request for a rescue attempt was made by William J. Donovan, the head of the US Office of Strategic Services (OSS) to Stewart Menzies, the chief of the Secret Intelligence Service (MI6) which was passed on to the War Cabinet.[5]

German troops moving a V-1 flying bomb

Reconnaissance photographs of the prison showed that Building A, the main prison building was cruciform shaped and 425 ft (130 m) long along the north side, 410 ft (120 m) on the south side, parallel to the main road, 325 ft (99 m) on the east side and 315 ft (96 m) long on the west side. The building was 49 ft (15 m) high at the eaves and the ridge of the roof was 62 ft (19 m) up; no machine-gun posts could be seen near the prison. The grounds of the prison were enclosed by a wall 11 ft (3.4 m) high with fenced courtyards to segregate prisoners while exercising. Intelligence reports put the German guards quarters on the short sides of the cruciform, drawn in a sketch received from the Resistance. The guards' mess was in the quarters at one end and the guard room in the other. The guards had lunch at noon and many of the prisoners had their midday meal at the same time in the central hall of the prison. Beyond the grounds and 80 yd (73 m) to the north was a trench near a road junction. Building B on the photographs appeared to be a small estate of semi-detached two-storey houses with gabled roofs, thought to be private dwellings and building C was marked as Hospice St Victor. The attackers would have to breach the prison walls and hit each end of the main building to blow open the gable ends. The shock of the explosions should spring open cell doors without destroying the building and massacring the prisoners.[6]

The Resistance estimated that around 700 inmates were in the prison but got the number of "politicals" wrong; such prisoners were usually accommodated in the German section of the prison, where about 100 men and women were being held. Normal prisoners were held in the criminal sections of the prison in such overcrowded conditions that in some places eight prisoners at a time lay down to sleep and the rest stood until it was their turn. The Germans put some of the "politicals" in with the normal criminals because of the lack of room but some criminals were really "politicals" arrested for criminal offences, who had remained incognito. The Gestapo and the Milice habitually detained people in the prison for weeks before informing the French judicial authorities, which also created misleading statistics; the internal prisoner count on 18 February was 832 inmates, including 180 held in the German quarters. Three British, an American and a Belgian agent were held in solitary, with three Americans captured in civilian clothes, who had claimed to be shot-down aircrew and been imprisoned as suspected a agents rather than prisoners of war. On 19 February, twelve men and three women imprisoned with the criminals and several inmates from the German section were due to be shot by firing squad.[7]

Four 500-lb MC bombs about to loaded into a Mosquito FB.VI of No. 464 Squadron at RAF Hunsdon

Operation Jericho ("Ramrod 564"), was allocated to 140 Wing, RAF 2nd Tactical Air Force.[8] Eighteen de Havilland Mosquito FB Mk VIs, six from No. 487 Squadron RNZAF (Wing Commander Irving "Black" Smith), six of No. 464 Squadron RAAF (Wing Commander Bob Iredale), both being Article XV squadrons. Six Mosquitos of 21 Squadron (Wing Commander Danny Dale) were to follow up in case the raid failed and bomb the prison, killing the prisoners.[9][lower-alpha 3] A photographic reconnaissance (PR) Mosquito was laid on for the Royal Air Force Film Production Unit (FPU), to film the raid. The raid was provisionally set for 17 February; the Mosquitos were to arrive over the prison at noon sharp, to catch the guards at lunch for the second wave to bomb them. The plan was divulged to the Resistance for them to tip off the underground in the prison and to arrange for accomplices to be waiting outside.[11]

Air Vice-Marshal Basil Embry, the officer commanding 2 Group, intended to lead the raid but was overruled and forced to stand down because he was involved in the planning of the Invasion of Normandy. Group Captain Percy Pickard, the RAF Hunsdon station commander took over command, despite having limited experience of low-level attack.[12][lower-alpha 4] Each Mosquito squadron was to have an escort of one Hawker Typhoon squadron, 174 Squadron and 245 Squadron from RAF Westhampnett and a squadron provided by Air Defence of Great Britain (the part of Fighter command not transferred to the 2nd Tactical Air Force) from RAF Manston.[14] A plaster of paris model of the prison was built, based on photographs and other details sent from France, a common practice in RAF planning.[15] The model showed the prison as it would look at a distance of 4 mi (6.4 km) at a height of 1,500 ft (460 m); attacking at such low altitude needed careful timing to avoid collisions.[12][lower-alpha 5]

Bomb load for the Mosquitos was two 500 lb (230 kg) Semi-armour piercing (SAP) bombs for the outer walls andtwo 500 lb (230 kg) Medium Capacity (MC) for the inner walls all fuzed for 11 seconds' delay.[16][lower-alpha 6] The first section of three aircraft from 487 Squadron were to attack the eastern wall at 12:00 at low altitude using the main road as a guide onto the target, the second three to make a north–south attack on the northern wall once the first bombs had exploded. The first section of 464 Squadron RAAF would attack the south–eastern end of main building three minutes later and the second section would attack the north–western end. The two sections of 21 Squadron, in reserve, were ordered to attack the prison ten minutes latter, one from the east and one from the north, if the attack had failed and bomb the prison, killing the occupants; if not, Pickard would transmit "Red, Daddy, Red" for the 21 Squadron Mosquitos to bring their bombs home.[18] The weather worsened after 10 February, with low cloud and snow across Europe; Hunsdon was covered by seep snow, amidst thick cloud and blizzards. On 16 February stringent security precautions were imposed and the camp sealed. Security operatives were based in the camp and mingled with the public in pubs and cafés, eavesdropping on telephones and censoring the post. A navigator, somewhat unwisely, called his girlfriend and mentioned "special circumstances", which led to all the aircrew being berated by Pickard for complacency. Thick cloud and blizzards persisted on 17 February forced a postponement; revised weather forecasts usually arrived in the afternoon and apart from a risk of icing, suggested that the weather over France might have improved by the next day.[19]

Somme river valley and hinterland, Amiens off-centre

On 18 February, the nineteen picked crews awoke to find RAF Hunsdon still covered with snow, under low cloud and blizzards but it was impossible to wait any longer. A more favourable weather forecast led to a decision to risk the operation and the 18 Mosquito bombers and the PR Mosquito "O-Orange" were prepared. The aircrews were woken at 06:00 and heard theirr Merlin engines being tested; briefing was at 08:00 and each man being subjected to an identity check as he entered the briefing room. A large box on a table contained a model of the target. Pickard, Embry and the wing navigation officer, Edward (Ted) Sismore entered the room and Pickard spoke first, explaining the unusual nature of Ramrod 564.[19]

We heard the details of this mission with considerable emotion....After four years of war just doing everything possible to destroy life, here we were going to use our skill to save it. It was a grand feeling and every pilot left the briefing room prepared to fly into the walls rather than fail to breach them. There was nothing particularly unusual in it as an operational sortie but because of this life-saving aspect it was to be one of the great moments in our lives.

— Wing Commander Smith[20]

The crews took their time to study the route and the model of the prison; by mid-morning the preparations were complete and the Mosquitos were lined up in their take-off order; few of the crews had flown before in such weather.[15] Pickard, in "F-Freddie", was to bring up the rear of the second wave to assess the damage and to call on 21 Squadron if need be. If Pickard was unable to send the signal ("Red, Daddy, Red") the crew of "O-Orange", the FPU Mosquito, would broadcast it instead. Rendezvous with the Typhoons was at Littlehampton.[20][21] The two Typhoon escort squadrons at RAF Westhampnett were briefed in a rush at 10:55 and began their take-offs at 10:10 without long-range tanks. At RAF Manston, the weather was so bad that the ADGB squadron commander refused to order his men into the air. Several 198 Squadron Typhoons were sent instead but did not reach Amiens until all but the FPU Mosquito had left.[14]

On 21 February, four Typhoons of 247 Squadron covered two PR Mosquitos sent to photograph the gaol. The aircraft were met by intense FlaK as they crossed the coast, the worst yet encountered by 247 Squadron. Flight Lieutenant C. E. Brayshaw, the commander of A flight was hit and turned back with a damaged engine but parts of the empennage (tail) detached and the Typhoon dived from 700 ft (210 m) into the sea off Cabourg, killing him; two Typhoons were damaged and one pilot wounded.[32]

The circumstances involving the request and the true purpose of the mission are still secret. While it has been purported that the request came from the French resistance, which had members in the prison scheduled to be executed, a post-war investigation by the RAF revealed that resistance leaders were not aware of the raid until the RAF requested a description of the prison.[38] The bombing enabled 258 prisoners to escape; several German guards were killed along with 102 prisoners and many escapers were later recaptured. A (Most Secret) letter of March 1944 for the head of the Secret Intelligence Service (SIS, also known as MI6), Stewart Menzies, thanked the RAF for the raid. When the head of the Special Operations Executive (SOE) French section, Maurice Buckmaster, was confronted with the letter, signed by "C", he stated that he had never seen it and that he had not requested the raid and did not know who had.[39] A 2011 BBC television documentary on Operation Jericho speculated the raid may have been intended to divert the attention of German military intelligence from Normandy, where the Allied invasion of France took place on 6 June.[39]

Details from Fishman (1983) unless specified.[40]

Focke-Wulf Fw 190