#alnwickhill — Public Fediverse posts

Womanning the Guns: the thread about Edinburgh and Leith’s WW2 aircraft defences

Today’s Auction House Artefact is a German Luftwaffe bombing maps centred on Edinburgh and Leith from WW2. These very maps may have been used in air raids on Edinburgh and Leith during that conflict. They have a deliberate yellow tint to make reading them under the night lighting in an aircraft easier and were printed on plastic-coated fabric to avoid creases and allow the navigator to mark on them in a wax pencil. Water, rivers, roads, railways and forests are all marked as obvious navigation markers. The map dates from 1941 and interestingly all the place names are in English – probably because German maps were basically reprints of captured or purchased British Ordnance Survey maps.

Luftwaffe bombing map of Edinburgh, Lothians and south Fife

Ziele (targets) were marked in yellow in ink that may have been luminescent so that they would appear brightly at night and account for the major docks and shipyards, airfields, military facilities and power stations along the Forth Coast. Below is my best guess at the full list of target sites (excepting the Forth Bridge, which I mistakenly overlooked).

Targets marked on the Edinburgh, Lothian & Forth map

The German Naval Command (OKM) at least bothered itself to translate some of the descriptive words on their charts into German, although again they had simply bought up sets of official and readily available Admiralty charts and reverse engineered them. The below OKM coastal chart was printed in 1938 but was already well out of date – entire interwar districts are missing; Craigentinny, Lochend and Restalrig in the east and Wardie, Granton and East Pilton in the north. The Western General Hospital is marked as Armenhaus, the translation of Poorhouse, which it had ceased to be in 1927. The fact that the railway to Leith Central Station is missing and there is no gasworks marked at Granton suggests the map predates 1900 and so was 38 years out of date at the time of issue!

WW2 German naval chart showing Edinburgh. Note that “armenhaus” (poorhouse) on the left side which dated from copying a much older map before the Craigleith Poorhouse became the Western General Hospital in 1927. Reproduced with the permission of the National Library of Scotland

Such maps show that the German military considered Edinburgh and Leith to be targets of interest. The British authorities were more than a little aware of this and were relatively well prepared when war broke out to defend the city from air attack.

The principle defence was provided by the fighter squadrons stationed at the RAF airfields at Turnhouse, to the west of the city, and Drem in East Lothian. These were the first British home air defences to be tested in the war; on 16th October 1939 a Spitfire of 603 Squadron from Turnhouse piloted by Flt. Lt. Gifford shot down a Junkers 88 bomber, one of 12 that had attacked the Royal Navy anchorages in the Forth. This was the first German aircraft of the war brought down over Britain and one of the four crew, Obergefreiter Krämer, was killed in this action. Spitfires from 602 Squadron from Drem under Flight Lt. Pinkerton brought down another bomber off of Crail, with 3 of the 4 crew being killed.

The German bombs begin to fall over the Forth Bridge from The Illustrated London News, 28th October 1939

But it wasn’t just from the skies that the city was defended, it was also protected from the ground by a ring of anti-aircraft gun batteries. This was a far cry from WW1 when Edinburgh and Leith were almost completely undefended when a Zeppelin air raid dropped 44 bombs and left 14 dead. All the anti-aircraft guns in Scotland (and Northern Ireland) were part of a Territorial Army formation called the 3rd Anti Aircraft Division, which was headquartered in Edinburgh.

Formation patch of the 3rd AA Division

There were five gun batteries around the city of Edinburgh plus a decoy site (although the one at Silverknowes may have been a decoy too and the others weren’t always armed depending on the phase of the war). The defences of Edinburgh and Leith benefited from their proximity to the Royal Navy Home Fleet’s base at Rosyth and were a component of a wider network defending the Forth anchorages, with thirteen further batteries along the coast. These defences were manned overall by 36th (Scottish) Anti-Aircraft Brigade, with Edinburgh being covered by the 94th Regiment. As the war progressed the organisational structure changed and due to a shortage of manpower mixed units were introduced by incorporating women of the Auxiliary Territorial Service (ATS) into the gun batteries.

Edinburgh Anti-Aircraft Battery designations and locations.

The gun batteries were of a standard design known as HAA sites (Heavy Anti-Aircraft) and the remaining structures of site EDG2 at Alnwickhill can still be clearly seen in aerial photography (and from the ground), underneath the equestrian paraphernalia from its modern-day use as a horse farm. The gun battery was composed of four QF (Quick Firing) guns – the pink dots – on concrete plinths with protective walls of brick and earth. These were arranged in an arc around a control bunker (white arrow). Each gun had ready-to-use ammunition lockers arranged around its inner walls, with more stored in two magazines (orange arrows) nearby. The distinctive circular feature to the north of the battery was a large calibration mattress for the site’s gunnery radar.

Google Earth aerial photography of Alnwickhill battery.

Most such batteries were armed with the QF 3.7-inch gun (the inches refers to the calibre, or diameter of the gun bore) that were sited at these batteries could fire an explosive shell weighing 28lbs (13kg) to an effective height of about 25,000ft (7,600m). They could shoot higher than this, but this was the maximum height to which they were able to accurately track and engage a target and was sufficient to engage all but the highest-flying enemy aircraft at this time. A photograph of one of Edinburgh’s 3.7″ guns is shown below

Gunners and their QF 3.7-inch gun in April 1942. Notice the size of the weapon behind them and the two men holding the large, fixed round. IWM (H 19090)

Each gun could fire 10-20 rounds a minute, depending on how well drilled the crews were and how physically fit they were to man-handle the heavy ammunition for any extended period of firing. The performance of the guns was therefore directly proportional to how fit the crew were and one of the principal responsibilities of battery commanders was to keep the men active. Interestingly the only other wartime photos I can find of the gun batteries around Edinburgh – at West Pilton – show physical training in progress.

Gunners of an anti-aircraft battery at the start of a cross-country run at West Pilton battery. They are being watched by the ATS women. Imperial War Museum IWM (H 30227)

The large protective shields around the guns in the background indicates that this site was actually armed with the less common QF 4.5-inch guns that were based on a Royal Navy design. They fired a heavier projectile (54lb or 24kg) to a greater height but the rate of fire was much reduced as a result, to about 8 rounds per minute.

The ATS women watch the men at Tug-of-War at West Pilton, 30th July 1943. It looks like they are dressed to compete too. Imperial War Museum H 31590

Each gun battery was controlled by a mechanical computer known as a predictor, which would be located at the central building marked with the white arrow on the aerial photo. This box of tricks had various dials into which its operators could dial input parameters about the target and ambient conditions (measured or guessed). The internal electro-mechanical innards of the box would calculate the direction and elevation in which each gun should be pointed and the guns followed its lead; the crews just had to keep on loading them.

The ATS women who “man” the Predictor of an unidentified Edinburgh battery. Two of the guns can be seen in the background, and camouflage netting appears to be strung over their positions. Notice the cable trailing from the arm in the foreground, which transmitted commands computed by the Predictor to the guns. IWM H 19092

The distance to the target and its height was calculated using a device known as a Rangefinder. The static HAA batteries used a huge 18-foot wide Barr & Stroud UB-10 device.

ATS women with their UB-10 rangefinder at an unidentified Edinburgh battery. IWM (H 19093)

Hitting a tiny, fast moving target moving in three dimensions – like an aircraft – with a projectile fired by a gun mounted miles away and tens of thousands of feet below was a tall order: so tall in fact that it was actually fundamentally impossible. As a result the projectiles were not actually expected to hit their target, rather they were to explode in its vicinity, close enough to do damage. Each projectile therefore had a clockwork fuse in its nose which was set to explode when it reached its target, a setting calculated by the Predictor which sent its outputs to another machine called the Fuse Setter. As part of the loading drill, each shell would be placed nose-first into the Setter which automatically adjusted the timer, before the loader shoved the projectile into the breach of the gun. Despite all this mechanical sophistication it was still a monumentally complicated mathematical problem that could be thrown out by tiny variations in the predictor inputs, or the weather, or the ambient conditions, or the target manoeuvring. It was calculated that it would take 41 thousand rounds fired from 3.7″ guns to bring down a single aeroplane! To put this into context, the five batteries of 4 guns around Edinburgh could fire up to 320 rounds per minute at best: if you could keep that up without running out of ammunition, it would take 2.2 hours to bring down an enemy plane – which by then was halfway back home. The role of these guns therefore was less actually shooting aircraft down and more just making sure they flew high enough and took enough avoiding action to make dropping their bombs a far more challenging and less accurate task.

To improve the accuracy of the inputs to the Predictor, the HAA batteries were progressively equipped with Gun-Laying (GL) radar sets which could accurately measure the range to target with an accuracy of about 50 metres. But these early GL radar sets were primitive by even the standards of the day and used a long wavelength which was susceptible to ground interference which caused false returns. To negate this issue the ground around each radar set was “calibrated” using an enormous wire mattress; this is the circular platform visible in the aerial photograph above of Alnwickhill. A 120 metre diameter ring of ground was flattened off, with the radar antennae positioned at its the centre on a raised platform. This area was laid with a 13,000m2 mattress of ½-inch chicken wire mesh, suspended on a wooden frame at a height of 1.5m from the ground. This required 230 rolls of wire mesh, 4 feet wide by 50 yards (1.2x46m) long; 650 miles (1,050 km) of wire per site plus a further 10 miles (16km) in the supports. Such was the scale of and priority given to these calibration mattresses that they consumed the nation’s entire supply of chicken wire at the time!

Gun-laying radar GL Mark II transmitter cabin

The anti-aircraft defences of Edinburgh also included more exotic weaponry; there were two Z-Batteries, reinforcing the regular guns at Craigentinny and West Pilton. These sinister sounding devices were batteries of 64 twin-barelled rocket launchers that fired projectiles which deployed a 500ft long cable suspended by a parachute, with a grenade attached at the other end. The theory was that the launchers would unleash their 128 rockets across the flightpath of an oncoming enemy aircraft which would hopefully snag one or more cables and then draw the dangling grenade towards itself. These were a rather makeshift, emergency weapon to try and make up for a lack of proper weapons and were rarely effective. They did at least create a decent fireworks display to give the public the impression that they were being defended and could be manned by older members of the Home Guard up to an age limit of 60 as the rounds were much lighter than the heavy 3.7″ and 4.5″ gun rounds – the age limit for which was 40. An Edinburgh Evening News report of 25th September 1944 reports that the 101st (City of Edinburgh) Home Guard Ant-Aircraft Rocket Battery at Craigentinny had been on operational service for 820 consecutive nights, i.e. since June 1942 and was the first such battery to become operational in Scotland. At the time of reporting, each of the Edinburgh rocket batteries had fired their weapons in anger once, both on the night of 24th March 1943, and each was credited with the shooting down of an enemy aircraft, which they shared with the regular gun batteries of the city.

Demonstrating one of the twin-rail launchers of a Z-battery to the Scottish press. This demonstration was in suburban Edinburgh and the bungalow housing in the background suggests this may be Craigentinny. Imperial War Museum credit.

For night-time actions there were powerful searchlights to try and identify targets for the guns to fire at – a largely fruitless task. I have so far identified two recorded locations and suggestions of more. The first is a photograph taken in April 1942 which shows a visit to a searchlight position near Hunter’s Tryst, looking towards the Pentland Hill. The visitor is the Rev. Ronnie Selby Wright, formerly minister of the Canongate Kirk and by then senior Padre to the Army’s 52nd (Lowland) Division. He acquired the nickname “Radio Padre” after a series of popular radio broadcasts he made for the BBC.

Rev. Selby Wright chatting to a Search-light detachment at Hunter’s Tryst. Photography by Lt. Lockeyear, 26th April 1942. Imperial War Museum, IWM (H 19086)

I have also found a Home Guard sketch map in the City Libraries collection that shows a portion of the south of the city at Southhouse, with X marking the spot of a searchlight position.

A sketch of Home Guard positions around Burdiehouse in the south of Edinburgh. © Edinburgh City Libraries

Lastly I have in my possession a little book that is an account of the Home Guard activities in this district of the city during the war and it has an illustration of two searchlights being visible from the Braid Hills. This is the earliest days of the war, note the men are still wearing their LDV (Local Defence Volunteers) armbands, lack an official uniform and carry a variety of weapons.

“A Blasted Heath – 02:00”

The last fatal air raid in Edinburgh occurred on 6th August 1942. After that, there was local peace in the skies until the night of 24-25th March 1943 when there were scattered attacks across Fife and the Lothians that saw some incendiary bombs dropped harmlessly on farmland near Balerno beyond the then outskirts of the city. In “This Present Emergency: Edinburgh, the river Forth and south-east Scotland and the Second World War“, Andrew Jeffrey suggests that three German Ju-88 bombers were downed by the defences of Edinburgh during this raid, with one crashing on Hare Hill in the Pentlands and two others ending up in the Forth. Newspaper reporting at the time credits a kill each to both Z-batteries, the 102nd battery at West Pilton sharing theirs with the guns. The online database of wartime Luftwaffe losses records the loss of a plane crashing into Hare Hill outside Balerno killing pilot Fritz Foerster, gunner Willi Euler, observer Heinz Kristall and radio operator Horst Bluhm. This was the aircraft that had jettisoned its bombs in the field shortly beforehand. The other two aircraft losses that night were one that crashed on a hillside in Northumberland while being attacked by an RAF Bristol Beaufighter and another that hit a hillside near Earlston in Peeblesshire.

Through improvements in training, organisation and the technology of radar and predictors, as the war progressed the number of rounds the guns would have to fire to bring down an aircraft was reduced by an order of magnitude, to just 4,100. For Edinburgh’s defences this equated to a much more realistic 10-15 minutes of firing to get a “kill“. The last German aircraft to fly over the city likely did so on May 5th 1944, but by this time the course of the war itself had also progressed and by mid-1944 most of the UK’s heavy anti-aircraft defences, including those around Edinburgh, were redeployed to the south coast of England to counter V-1 flying bombs. The more mobile parts of Scotland’s 3rd Anti-Aircraft Division also went south and were attached to the Allied invasion forces, fighting with them across mainland Europe. By this point further technological advance had brought the number rounds required for a “kill” down by another order of magnitude to about 100.

With their guns removed the anti-aircraft defences of the city were mothballed, but we can clearly see their distinctive ground layouts in post-war aerial photography. Each gun battery is accompanied by rows of huts and buildings to house and support the personnel and all the required stores. These photographs suggest that battery EDG4 at West Pilton was fitted with radar as we can see the large circular footprint of the radar calibration mattress (the photo below of Sighthill is censored, but an uncensored version also shows the outline of the mattress). They also hint that battery EDG5 at Silverknowes was either never finished or was purely a decoy.

EDG3 Battery, SighthillEDG1 Battery, CraigentinnyEDG5 Battery, SilverknowesEDG4 Battery, West PiltonPost war aerial photography showing four of the Edinburgh HAA batteries

Although the sites were out of use by the war’s end they remained military property and a state secret. They are missing from detailed 1:1250 Ordnance Survey town plans made in 1944 and on some versions of the above aerial photos they have been censored; crudely scratched out or in the case of Alnwickhill and Sighthill, more subtly removed.

EDG1 battery, CraigentinnyEDG4 battery, West PiltonEDG2 battery, AlnwickhillPost-war censorship of the AA battery sites

The defences of were officially stood down in 1948 and each site had a different fate after that. Sighthill was soon cleared away and the land returned to civilian use when the new industrial estate was laid out there post-war. The huts and structures of West Pilton were used as a Territorial Army (TA) training centre before being turned over to a rather grim-looking and latterly notorious housing estate. The huts at Craigentinny were also re-used, given over to emergency post-war housing as Craigentinny Camp before being returned to their pre-war use of a golf course. The camp at Alnwickhill was kept on by the army before later being used by Ferrantis at East Pilton for testing military electronics and weapons. One of its uses was for testing Bloodhound anti-aircraft missiles in the 1950s, demonstrated wonderfully by the below photograph showing such a missile pointing towards the distant Arthur’s Seat.

A Bloodhound missile at Alnwickhill pointed directly at Arthur’s Seat. Credit likely BMPG

Along with the well-preserved structures at Alnwickhill, the dummy battery at Hilltown near The Wisp survives largely intact as it was returned to the farmer’s field from where it sprung and left too the odd cow to shelter in. From the air its layout is still unmistakably a very close copy of one of the active batteries.

Modern aerial imagery of the Hilltown dummy battery

Edinburgh and Leith were mercifully spared most of the horrors of aerial bombing meted out to other cities during WW2. Altogether there were 21 civilian deaths and about 210 injuries caused directly by aerial bombing during the war. Further details can be read in the thread about the air raids on Edinburgh and Leith during WW2 and the civilian loss of life they caused.

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