In Part 1 we saw how RAF Thurleigh emerged from the Bedfordshire countryside and was shaped by early Luftwaffe raids on the construction site. We saw the arrival of new RAF training units flying Wellington bombers, and their subsequent departure to the far East. We saw how tragedy and fatal accidents claimed the lives of new Polish crews training at the station with 18 OTU, and how with Bomber Command moving on, Thurleigh’s role was set to change dramatically.

A New Ally Arrives: The American Transformation of Thurleigh

At the end of 1941, after the surprise attack on Pearl Harbour, America entered the conflict declaring war on both Japan and Germany and their allies. Over the next few months high ranking officials hurriedly put plans in place to send twenty-eight American bomb groups to the United Kingdom, and the European theatre of war. In a meeting between General Eaker and Air Chief Marshal Arthur Harris, discussions took place that would not only facilitate such a move, but also give the Americans suitable airfields on which to house their new heavy bombers.

Aware that most British airfields were too small to accommodate the American’s heavy bomber units, Eaker went on to press Harris for specific details including both their locations and the facilities available at each one. Anticipating this, Harris handed over the identity of eight potential sites, many of them RAF satellite stations, but all suitable for the American’s use. Amongst these were the airfields at Polebrook, Chelveston, Molesworth, Kimbolton, and of course Thurleigh.

Initially designated Station B-4, Thurleigh would then undergo a major modification programme, one that would bring it up to the new Class ‘A’ standard, a specification that would make it suitable for the American heavy bombers, both the B-24 ‘Liberator’ and the B-17 ‘Flying Fortresses’ that Eaker was sending over.

Construction crews quickly began work, both extending and reinforcing the short runways; they added additional hardstands, and expanded both the technical and domestic sites. Upon completion, the airfield would feature three concrete runways: one of 2,000 feet and two of 1,400 feet in length, each being the standard 50 yards wide. Aircraft dispersal was facilitated by a total of 51 loop and frying-pan style hardstands arranged around a full length perimeter track.

In addition, and unusually, four T2 hangars were erected, providing protective aircraft shelter and maintenance facilities. The bomb store was discreetly placed in Galsey Wood, a wooded area to the northwest and away from the main flying and accommodation areas – an essential safety precaution in wartime.

Fifteen accommodation sites, including two communal areas, two WAAF quarters, medical facilities, and barrack blocks, were all established along the road leading away from Thurleigh village to the south-west of the airfield. These sites employed a variety of wartime construction styles – brick, timber, concrete, steel, asbestos, and plasterboard – using standard designs from Laing, Nissen, Seco, Jane, Romney, and others. At full capacity, the base would accommodate over 440 officers and more than 2,500 enlisted personnel, including members of the Women’s Auxiliary Air Force.

After being allocated to the Americans on August 10th 1942, Thurleigh opened with its first residents. On 7th September that year, the first and only front line bomber Group to operate from the airfield, the 306th Bomb Group (BG), arrived with its four squadrons of B-17s: the 367th, 368th, 369th and 423rd Bomb Squadrons (BS). In command would be Col. Charles B. “Chip” Overcracker.

The 306th Bomb Group: Arrival of “The Reich Wreckers” (Autumn 1942)

Known as “The Reich Wreckers” the 306th would have many claims to fame, including being the oldest operational Bomb Group in the 8th Air Force and the only one to remain at the same station (Thurleigh) in England for the longest period of time. In addition, they were the first unit to have personnel achieve their first tour of operations, a major mile stone that gave the whole air force hope that going home was indeed possible.

The Group, designated the 306th, were constituted on January 28th 1942, and activated in March that same year. Their journey to the UK began at Gowen Field in Idaho, transferring through Wendover Field to their embarkation point at New York onboard HMS Queen Elizabeth. The ground echelon set sale, travelling across the treacherous north Atlantic route to arrive at Greenock in Scotland, on September 5th, 1942.

The air echelon travelled separately, arriving a week later in small groups touching down at Thurleigh between the 8th and 13th September, having flown their own thirty-five aircraft across the northern route. This cold and bleak route took them via Greenland and Iceland, before passing over northern Ireland to arrive at Prestwick in Scotland on the north-west coast. During the journey over, one B-17F, with a crew of nine and one passenger, exploded for no apparent reason, 150 miles from Gander Lake,  Newfoundland. A second aircraft also ditched in the Irish Sea. The crew in this instance were picked up, but the aircraft was lost in the cold waters of the North Atlantic. This was the third B-17 the group had lost since their inauguration.

The 306th would go on to fight in some of the most bitter air battles of the war, including Schweinfurt, Stuttgart, Hannover, Berlin, Ludwigshafen and Leipzig. They would lead the first US bomber penetration of German skies; Big Week in February 1944, and go on to support both the Normandy landings and the St. Lo breakout. They would remain active throughout the war achieving numerous awards including two Medals of Honour, numerous Purple Hearts and two Distinguished Unit Citations (DUC) for action over occupied Europe.

Their arrival at Thurleigh was not however the great dream they may have wished for. On unloading, the 306th were greeted by unfinished buildings and mud – lots of it. Tents immediately formed the basis of personnel  accommodation and the officers’ mess was so small, staff had to operate in three shifts to enable them all to get fed.

Not only was a considerable amount of work needing to be done to get the station ready, but being new to the European theatre, a huge amount of ‘up-skilling’ was also going to be needed. To this end, intelligence staff, operations controllers and flight controllers were all sent to RAF stations to learn the ‘tricks of the trade’ enabling them to operate alongside their British counterparts in what was about to become a very busy airspace.

Baptism by Fire: First Operations and Early Losses

This poor start was then compounded when on October 2nd 1942, during a practice mission over the Wash, one of the waist gunners of B-17 #41-24492 ‘Lady Halitosis‘ of the 367th BS, suffered oxygen failure. In a bid to help the gunner, the pilot put the aircraft into a steep dive losing some 9,000 feet of altitude in a matter of minutes. The dive and subsequent recovery was so severe that the aircraft’s control cables snapped, and part of the starboard wing broke away taking an engine with it. The aircraft then caught fire and the bomb bay doors became detached. One of these doors, struck the rear section of the aircraft with such force that it severed the fuselage at the tail. The rear gunner, trapped inside his position, desperately tried to escape, hammering at the plexiglass and fuselage to break out. With only a 1,000 feet of air left, he just managed to break through the fuselage and free himself from his falling coffin. His parachute luckily opened, and he landed safely some distance away south-east of Spalding in Lincolnshire. His luck, already used exhaustively, somehow managed to continue on for a few moments more, when the remainder of the burning  B-17 came crashing down a mere one hundred yards or so from where he was sat.

Rescue crews from a nearby anti-aircraft gun ran to the scene but they were unable to get close enough to the wreckage due the the ferocity of the fire, and sadly, all six of those left inside, perished. During the whole episode only one other crewman managed to escape – Ball Turret Gunner Private Raymond McAskill – suffering slight injuries as he did so.

The event was so understandably harrowing for gunner S.Sgt. William Kellum, that he was eventually grounded, his mental state rendering him ‘unfit’ to continue on after having only carried out a few missions following his horrific flight debut in England.

With this disaster behind them, the 306th took to the air once more on their maiden operation on October 9th 1942, an operation to bomb the steel works at Lille, France. But again, it was not to be the glorious outcome they all would have wished for.

For the first time, over 100 American bombers, a mix of B-24s and B-17s, led by the soon to be legendary Col. Edward “Ted” Timberlake, flew across the English Channel to France. The huge formation, escorted by over 400 fighters, a mix of Spitfires – now part of the 4th Fighter Group –  and P-38 “Lightnings”, knew how important this mission was going to be.

Waiting for them were the battle hardened Luftwaffe pilots of JG 26 in their FW190s, they were not going to let the bombers through easily and the sky would be full.

With departure planned for 08:32, the lumbering giants gradually rose in to the air and set route for France.

As the bombers reached the target, the Luftwaffe struck, focussing initially on the B-24s of 93rd BG. Attacking from their favoured position, the rear, they struck at the formation ignoring the fighters flying high above. Releasing over the target, bombing was considered poor, some bomb aimers not even finding the target and so dropping their bombs on alternative sites. During the action, the formation had become disjointed, partly due to some turning back with technical problems and partly to some being knocked out by enemy fighters – the defensive wall had been breached.

As for the 306th, a second aircraft was lost, and this time there were no survivors. A third B-17, #41-24486 “Man O’ War” piloted by 2nd. Lt. James M. Stewart, lost three engines and its radio failed. It was about to ditch in the English Channel, when – as if out of a boy’s action story – a Spitfire, flown by Flt. Lt. Andrews of 91 Sqn, appeared alongside and guided the B-17 to RAF Manston in Kent where it made a successful crash landing. None of the crew were injured in the event, saved no doubt by the actions of Flt. Lt. Andrews.

Inexperience played a large part for many of the crews taking part that day. Being new to operational duties, not only had they suffered poor aiming but gunners had made hugely exaggerated claims about the numbers of enemy aircraft shot down – although probably unknowingly to them. In reply to the frenzied attack on the formation, air gunners sprayed bullets all over the sky hitting everything except the enemy. A mix of poor training and a determination to prove their worth, had been a recipe for disaster.

Not only was the bomb aiming poor but so was the navigation. Many navigators, like the gunners, were simply not experienced enough, nor trained well enough for the European geography. With thick cloud being present almost all of the time, many new crews were unable to identify specific geographical features and were simply lost within 10 minutes of leaving their home base.*⁴

During this initial operation experienced enemy fighters were both fearsome and determined in their attacks. Whilst few bombers were actually shot down, all of those in the lagging 306th received hits from the FW-190s – some severely. The opening few weeks had been a real eye opener for the 306th, an experience resembling a baptism of fire not only for those newbies the “The Reich Wreckers“, but for the Eighth Air Force as a whole.

Weather, Warnings, and Misfires: October’s Frustrating Missions

The British winter weather then intervened. Several operations were cancelled as were training flights which were greatly needed. A cancelled flight to Lorient on October 21st, merely two weeks after their first operation, meant that the entire 306th returned without dropping a single bomb. The declining weather and poor visibility was to blame, but some ninety aircraft did continue on, and of those who did bomb, their bombs simply “bounced off” the submarine pens, having no impact whatsoever. *⁵

Aircrews were learning that operations over enemy territory were high risk, but even scrubbed missions could have their problems: aircraft still had tanks full of petrol and bomb-bays were still filled with tons of high explosives. For the 306th, troubles on this mission began even before they had left British airspace. When the abort signal came through, it instructed crews to drop their ordnance in the Wash – a large body of shallow coastal water off the north Norfolk coast.  Whilst it became a common practice for scrubbed missions, for one B-17 it was not going to be a simple or straight forward task.

Emergency Landing: A B-17 Touches Down at Sutton Bridge

B-17F, #41-24460 ‘RD-A’, “Little Audrey” of the 423 BS, began the process of releasing its bombs when suddenly the life raft latch broke loose causing the raft to escape and wrap itself around the elevator rendering the aircraft difficult to control.

Now being unstable in flight, the B-17 had to find a safe place to land, and near to the Wash was the firing range at Holbeach and its associated airfield at RAF Sutton Bridge. A physically small grass airfield that was used for gunnery training of RAF fighters, it was not designed to take large four-engined heavy bombers. The likely hood of getting down safely was slim, but after using all his skill and judgement, the pilot managed to put the bomber down safely on the grass much to the joy of those inside the bomber. Once remedial work had been carried out on the aircraft, the crew began to prepare for the take off, an event just as risky as the landing and with odds just as bad.

Being an unusual aircraft to see at Sutton Bridge, huge crowds gathered to see the B-17 and to witness what could have been a terrible accident had the take off been misjudged on the small grass strip. Fortunately though, again using all his skill and judgement, the pilot got the aircraft up and the B-17 successfully rose in to the air making its way home to Thurleigh being waved off by the extensive crowd of locals gathered by. *⁶

Mounting Pressure: Heavy Losses and Royal Visits

The early days of November 1942, saw missions 3, 4 and 5 for the 306th. Visits to Brest, Lille and St. Nazaire, saw a further four aircraft lost with all crews listed as ‘missing in action’. These early loses were beginning to mount, and those in charge were beginning to voice their concerns.

On November 13th, a Royal visit was made in which General Carl Spaatz and King George VI carried out a tour of the many airfields now in the region, including Thurleigh. Whilst the Royal party were here, they were shown around the airfield, seeing the various facilities available. They were also introduced to several crews and ground staff with whom they chatted happily.

The B-17’s Fatal Flaw – and its Remedy

But the relief brought by important visitors didn’t prevent problems in the air. By now, the Luftwaffe had got the measure the of the B-17 and pilots, such as Oberstleutant Egon Mayer, quickly found its Achilles heel. Even though bristling with guns, the B-17s suffered from ‘blind spots’, areas where the gun’s arc didn’t cover. This made the bomber vulnerable, and the worst position was through a direct full frontal attack. New tactics were then used by the Luftwaffe, directing fire directly at the front of the aircraft, potentially its most vulnerable position. It became so successful, that some 30% of pilots and co-pilots in the 306th were killed in such attacks.*⁷  With little protection, early model B-17Es were quickly withdrawn from front line operations and investigations carried out into a possible remedy to the problem.*⁸

Naturally the B-17 crews realised this vulnerability too, and also set about finding their own remedy. Whilst official routes were being taken to solve the problem, these were taking too long, and a quicker solution was needed. Within the 367th BS an armourer  and a welder (S. Sgts. James C. Green and Ben F. Marcilonis) got together and took matters into their own hands. They designed and built a new bracket that could hold a heavy .50 machine gun fitted into the nose of the aircraft to protect this gap in the forward arc.  Once constructed and fitted, trials began, the ‘guinea pig’ being a B-17F #42-5130 named “Sweet Pea“.

The bracket fitted to Sweet Pea, proved to be so successful that it was adopted not only by the 306th but the 8th Air Service Command as a whole*⁹ becoming part of a modification feature to future B-17 models.

The aircraft  was unusual for other reasons though. It was ‘christened’ on December 20th 1942, by a small orphan girl called ‘Maureen’ whom the 367th BS had adopted from a London orphanage. They gave her the nickname ‘Sweet Pea‘ and to mark the occasion, she dipped her hand in paint and placed a print on the aircraft as a form of dedication.. Like many aircraft of the ‘Reich Wreckers’, Sweet Pea would fly on several operations, suffering a great deal of damage in the process; eventually failing to return from operations to Lorient on March 6th 1943, with one airman killed in action, one evading and eight being taken prisoners of war.

Thurleigh had transformed from a training airfield into a heavy bomber base ready for its new American role. Upgraded to Class “A” standard it soon became home to the 306th Bomb Group – “The Reich Wreckers.” Their arrival in September 1942 was far from smooth though: unfinished buildings, muddy conditions, and a steep learning curve in the European theatre made for a difficult start. Early missions brought tragedy, from training accidents to heavy combat losses, while poor weather and inexperience compounded their struggles. Yet alongside setbacks came resilience, adaptation, and even innovation, as crews refined tactics and strengthened their aircraft. With these foundations laid, the stage was set for the 306th to face the increasingly bitter air battles of 1943.

The entire history can be read in Trail 65

In Trail 65 we head west again this time to the borders of Bedfordshire and Northampton, where a former wartime airfield evolved from a base for USAAF bombers into a centre of aviation excellence. First built during the Second World War, it supported critical missions over occupied Europe. In the post-war years, it transitioned into a leading site for aeronautical research, contributing to major advances in jet technology, carrier operations, and automated landing systems. Although official flying ended in 1994, the site continued to reflect a remarkable legacy, marking its place in history as a cornerstone of Britain’s military and civil aviation development.

In this trail, we go back to Bedfordshire and the former RAF Thurleigh.

RAF Thurleigh (Station 111)

Situated some 6.5 miles north of Bedford, RAF Thurleigh was built on land approximately 250 feet above sea level. Although not a high elevation, its open plateau setting – typical of many wartime airfields – exposed it to the elements. Surrounded by multiple river sources, the location benefited from good natural drainage, aiding its suitability as an airfield site.

The nearby village of Thurleigh has a long recorded history, appearing in the Domesday Book as La Lega*¹ – a name that over centuries, has evolved into its current form. In a similar fashion, the airfield that bears the same name, would come to be known under many titles of its own: RAF Thurleigh, USAAF Station 111, RAE Bedford, Bedford Aerodrome, and Thurleigh Airfield Business Park amongst others. Yet throughout its history, one theme remained constant – aviation.

The War Reaches Bedfordshire: Early Bombings and Construction (1941)

Thurleigh’s association with the Second World War began even before construction commenced. Isolated bombing incidents in the parish during 1941 – possibly the result of jettisoned bombs from German aircraft – marked its early wartime experience. Once the airfield’s construction began however, it quickly caught the attention of the Luftwaffe. On 17th April that year, eight enemy bombs were dropped directly onto the construction site, causing damage to the incomplete runway. A second attack on 12th August 1941 saw another eight bombs fall along the northern boundary, again damaging the airfield and rupturing a water main*². Both raids highlighted how conspicuous such developments were to enemy reconnaissance and subsequent aerial attacks.

Once land had been sourced, the airfield’s construction was carried out by the company W.C. French Ltd. and officially opened during the summer of 1941. At this early stage, Thurleigh was a modest airfield in size, suited only for fighters or light to medium bombers. Its first operational residents were the personnel from No. 18 Operational Training Unit (OTU), part of the RAF’s Bomber Command. Having recently adopted the twin-engined Vickers Wellington, 18 OTU (formed from the Polish Training Unit in No. 6 Group, in June 1940 to train light bomber crews for Polish operational squadrons) was tasked with preparing new crews transitioning onto bombers ready for active duty.

Though OTUs were primarily training units, they often found themselves involved in operational sorties, especially during periods of ‘maximum effort’. As a result, many crews suffered casualties, even before they joined a front-line operational squadron.

Following them, in October 1941, 12 Operational Training Unit – first formed at RAF Benson in April 1940 – briefly stayed here. Their residency lasting a mere month, it remains unclear whether it was the entire unit, or just detachments  that were present here during that time. It was also at this time that the first recorded aircraft landing took place at Thurleigh: Wellington IC R1234*³ touching down on the new runway, marking a small but important milestone in the station’s dramatic history.

12 OTU Were not the only training unit to reside here. The Central Gunnery School (CGS), famed for “training the trainers” remained here from December 1941 until their departure to RAF Sutton Bridge on the Lincolnshire / Norfolk border in April 1942.

First established at RAF Warmwell on 6th November 1939, the CGS would train both gunners of bombers and fighters in the art of aerial warfare, those attending having proven themselves in combat already. Once trained, they would return to their original squadrons and pass on their valuable knowledge to others.

Tropical Kit and Tragedy: The Brief Story of 160 Squadron (1942)

Thurleigh’s relative quiet made it an ideal location to raise a new unit, and on January 16th 1942, the ground echelon of 160 Squadron RAF, formed here. Created as a Consolidated B-24 Liberator unit under War Establishment order WAR/ME/448 (dated 31st December 1941), the squadron’s formation began with the arrival of 108 airmen, who were followed by a further 126 the very next day. Over the following weeks, the numbers of ground crew and support staff swelled, as it did, each one was issued with tropical kit, a move that suggested a deployment to the Far East.

Throughout the weeks that followed, the air echelon underwent heavy bomber training some with 1653 Heavy Conversion Unit at RAF Polebrook, while  other crew members were sent to RAF Upwood for additional preparation. In mid-February, the posting finally came through and the ground party departed enroute to the Far East. Meanwhile, the air crews transferred to RAF Lyneham in Wiltshire, where they collected their new B-24s before they too left for the Far east.

Tragedy and Transition – May 1942

The now quieter Thurleigh would then experience a series of tragic accidents. On 18th May 1942, Wellington IC DV783, flown by a Polish crew led by Pilot Officer J. Kilmcsyk, crashed shortly after taking off. Just moments after departing the runway, the aircraft suddenly, and without warning, dived into the ground; the ensuing fireball killing all five crew members onboard. The Wellington, along with the crew’s bodies, was later recovered and the airmen interned in the Polish War Graves section of Newark cemetery in Nottinghamshire.

This was the second fatal crash suffered by the unit in as many days, a tragedy that was compounded by another such incident the following day – although mercifully this time, there would be no fatalities.

Not long after this short but devastating period, 18 OTU departed Thurleigh, a move that signified the end of its ties, as a training airfield, with Bomber Command. For the remainder of the war,  there would be no further front line, RAF units assigned here, and attention now turned to its new owner, the United States Army Air Forces.

In Part 2, we continue our journey through Thurleigh’s wartime history. We see the arrival of the USAAF, and share their experiences both good and bad. We learn of the failures of the B-17 and how through innovation they overcome these problems becoming one of the most successful bomb groups of the war.

The full story of RAF Thurleigh can be. read in Trail 65.