JamesFennell MBE Profile picture
Stabilisation Practitioner, Honorary Research Fellow, University of Birmingham, MBE, Defence & History, Literature, Tech - work 130 warzones so far. Have dog.
Oct 22 16 tweets 6 min read
Getting things done in Britain:

How Sgt. Rod Banks and the Mosquito shadow modification network gave Mosquitos the extra ooph to avoid Luftwaffe fighters.

Rod Banks was a lowly engine fitter at RAF Marham, exceptional engineer and former Rolls Royce apprentice. Image When the Mosquito entered service it was very fast at 380mph at altitude, but soon pilots found that the new Bf 109G and Fw 190A fighters could catch them.

Banks had realised there was a small discrepacy between the tolerances of the engine and the the meximum boost limit. Image
Oct 21 29 tweets 10 min read
On Trafalgar Day its worth looking at the post-1840 reforms that turned Britian's then often defeated navy into the precision instrument of victory wielded by Nelson and Pellew in the Napoleonic Wars. Many have resonance to this day. Image The key moment was the appointment of John Montagu, 4th Earl of Sandwich, as First Lord of the Admiralty from 1747-51, 1763 and 1771-83. He oversaw a series of far reaching naval reforms and also invented fast food, both of which came to define the Anglo-Saxon world. Image
Oct 9 9 tweets 2 min read
Carl Schmitt's 'state of exception' being engineered in America. Schmitt, a jurist and philosopher (and later a Nazi party member), introduced the idea of the 'state of emergency' in his 1921 essay 'on dictatorship' as a concept to enable a strong executive power to overrule the Weimar constitution. The Italian philosopher Georgio Agamben developed this further in his 2005 book 'state of exception' to show how this could be extended indefinately.

Schmitt helped draft legislation after the Reichstag Fire to temporarily suspend civil liberties which was never repealed.
Oct 4 24 tweets 9 min read
Second lives.

Many obsolete aircraft had second lives on D-Day. 12 new Hurricane IIc were modified to carry 31 cu ft.mail by 1649 (Air Dispatch Letter Service) flight from RAF Northolt. Working with the Post Office they delivered mail to US and UK forward airstrips in France. Image Mail was carried in the port droptank and in the fuselage aft of the pilot. Guns were retained but no ammo was carried to reduce weight. By this time Hurricane production was ending, but they were still used by training units. Image
Sep 30 32 tweets 12 min read
The A22 Churchill infantry tank - an unlikely success story.

A🧵

The Churchill failed, failed and failed again, and yet evolved into the most useful British tank on the 1944-5 battlefield. Image The Churchill has its origins in hastily dusted off plans to send a new BEF to France after the Munich crisis in 1938.

Envisaging a return to 1914-18 trench warfare, the War Office issued a requirement for a larger gap-crossing infantry tank to complement the Matilda. Image
Sep 10 17 tweets 6 min read
1SL Gen Gwyn Jenkins set out an ambitious strategy for rebuilding the Royal Navy yesterday:

1⃣ within 100 days a plan to deliver full capability in 4 years and new assessment methods trialled to select a new cadre of wartime commanders.
gov.uk/government/spe… 2⃣ mass to be generated by rapidly delivering uncrewed systems to team with crewed ships, submarines and aircraft. The first LUSVs and collaborative combat aircraft to be inducted in 2026.
3⃣ largest maritime warfighting training overhaul since the Cold War. Image
Aug 30 7 tweets 3 min read
The UK's plan to aquire 7,000 long range weapons is becoming clearer. In addition to the FC/ASW 1,000km TP15 and RJ10 subsonic stealth and supersonic cruise missiles for the RAF and RN, the Army will deploy 600km BRAKESTOP OWEs and NIGHTFALL tactical ballistic missiles. Image Both BRAKESTOP and NIGHTFALL are sovereign developed, ITAR-free and domestically produced capabilities, like FC/ASW, but unlike the Anglo-French-Italian MBDA missile programme and to be low cost and rapidly developed for fielding before 2030. Image
Aug 23 34 tweets 12 min read
Lets talk about castles.

The castle was a Norman military innovation of the 11th century. It enabled a small elite, highly mobile military force to dominate and control large territories and much larger populations. The castle served as an impregable command post, observation post, supply dump and garrison for a highly trained raiding force of mobile (mounted) warriors. These became 'knights'. The Normans, of Viking descent, used them to wrest control of territory in northern France. Image
Jul 11 11 tweets 4 min read
IAMD priorities
- Portsmouth, Faslane, Devonport, Gibraltar naval bases
- Lossiemouth, Coningsby, Marham, Brize Norton, Akrotiri RAF bases
- GCHQ Cheltenham, Whitehall, Wyton, Waddington C2, ISR.
- Fylingdales and 8 Remote Radar Heads
- AWE Aldermaston and 6 nuclear power plants. Image On the 'The Wargame' Sky podcast, Gen. Sir Richard Barrons, one of the SDR architects, said an 'Iron Dome' for the UK would cost £24 billion and is thus unaffordable.

Nevertheless, we should explore cheaper and more flexible means of providing IAMD against a first strike. Image
Jun 30 15 tweets 5 min read
In the 1930s the RAF allocated '300' series squadron numbers for crews from occupied nations and the '400' series for Article XV squadrons crewed by commonwealth allies.

Numbers 1-299 were regular RAF, 500 series for the Special Reserve and 600 for the Volunteer Reserve. The first 300 series squadrons were formed in July 1940 with experienced Polish refugee aircrews.

Four (300, 301, 304 and 305) were bomber squadrons, initially given Fairey Battles withdrawn from RAF service, which were exchanged for Vickers Wellingtons by the end of the year. Image
Jun 26 17 tweets 6 min read
The missing link to make sense of the SDR and recent decisions on air power is a major ACP (Loyal Wingman) programme for both RAF and FAA.

This is an SDR recommendation and needs to be properly funded (billions), but is unlikely to get those resources until after 2029. Image Introduction of an ACP to FAA needs to be timed with a 2030s MLU of the carriers, but can enter service earlier with the RAF, initially as part of UK IAMD and for the SEAD/DEAD mission, increasing mass in the fast jet force. Image
Jun 18 31 tweets 11 min read
With the prospect of the RN getting a new Type 92 sloop, I though I'd take a look at the history of the 'sloop' in the Royal Navy.

Sloop is an anglicised Dutch term, meaning a small flat bottomed ship, adopted by the Royal Navy from the 17th c. for small second class warships. Image During the 18th and early 19th centuries the sloop was formalised as an unrated single gundeck warship of 18 guns, under the command of a 'Master and Commander' rather than a post Captain. Smaller than frigates, they were used for trade protection on distant outposts. Image
Jun 17 11 tweets 4 min read
Hunt class escort destroyers.

Concerned that the new classes of large fleet destroyers were unsuited for convoy escort duties, a new type of small escort destroyer was designed in 1938-9.

The design was for a 1,000 ton ship based on the Bittern class colonial sloops. Image Like the Bitterns, they would be built to naval standards, but power was raised from 3,300 to 19,000 shp on two shafts, giving a speed of 28 knts.

This resulted in considerable loss of range, making them only really suitable for North Sea and Mediterranean service. Image
Jun 17 6 tweets 2 min read
O & P class destroyers formed the 1st and 2nd Emergency Flotillas, and were the first wartime emergency classes.

Stripped down J-class hulls with raised fo'castles that could be built quickly, the 'O' class had four 4.7" low angle guns, similar to the earlier pre-war classes. Image The 'P' class were armed with five 4" HA guns for improved AA performance.

Both classes were optimised for escorts duties with only four 21" torpedo tubes.

AA armament was a quadruple 40mm pom pom and six 20mm Oerlikon guns, four on power operated twin mounts. Image
Jun 17 4 tweets 2 min read
Weapon class destroyers were the last RN wartime design, a larger follow-on to the War Emergency Classes, which could be built in yards too small for the Battle class.

Armament was similarly arranged to the Battles, with four 4" guns in new twin power operated mountings forward. Image They had a heavier torpedo and ASW armament than the Battles - 10 torpedo tubes and twin 'squid' ASW mortars, and were optimised for ASW escort of carrier groups.

Secondary AA armament was two twin STAAG radar guided 40mm bofors mounts and four single 40mm bofors mounts. Image
Jun 16 7 tweets 3 min read
The L & M class destroyers were the last classes laid down for the Royal Navy before the war in 1938-9.

They were larger and more complex ships than the J, K and N classes, incorporating three power operated twin 4.7" dual-purpose gun barbettes as main armament. Image Four were completed with four twin 4" HA mounts in place of the 4.7" barbettes, and it was found the better AA performance and higher rate of fire of the 4" guns offset the loss in weight of shot.

Secondary AA armament was a quadruple 40mm pom pom and four twin 0.5" HMG mounts. Image
Jun 16 6 tweets 2 min read
The J, K and N class, were built during the run-up to war, and were smaller and cheaper versions of the Tribals. They swapped two 4.7" guns for two extra torpedo tubes.

Five 'N' class were all crewed by the RAN, two by the Dutch Navy in exile and one by the Polish navyin exile. Image As some of the most modern destroyers in Royal Navy service during the first two years of the war, they were heavily engaged in the Atlantic, Mediterranean and Inidan Ocean, and 13 of the 24 ships were lost - mostly to aircraft while on convoy escort duties in the Med. Image
May 24 18 tweets 3 min read
Why is Diego Garcia and BIOT different from other overseas territories?

1./ At the time of Mauritius and Seychelles independence in 1966, BIOT was created specifically for UK defence purposes, with an agreement to return it to Mauritius once UK no longer needed the base.

1/2
2./ It was created in the context of the UK withdrawal from East of Suez, and its naval and air bases at Singapore, Gan (Maldives) and Aden (Yemen), so that USN and USAF could pick up the burden in the Indian Ocean.

3./ the population of DG was forcibly evacuated to Mauritius.
May 11 96 tweets 34 min read
The Surface War, the Atlantic 1941-2: a 🧵..

After Operation Berlin and the commissioning of Bismarck, Tovey's Home Fleet was faced with the prospect of both Donitz's u-boat campaign and sustained KM surface raiding disrupting the vital flow of troops and supplies to Britain. Image By mid-1941, the wartime shipbuilding programme began to pay dividends, with large numbers of smaller combatants coming into service.

Dozens of rapidly-built convoy escorts, destroyers, escort carriers and AA light cruisers would need to backfill the gaps in the surface fleet. Image
May 10 47 tweets 17 min read
The Surface War, Part 5 - Mediterranean 1942.. a 🧵..

Cunningham's strategic assessment in January 1942 was dire.

Force H had been gutted for the Eastern Fleet, Forces B and K at Malta had been decimated and the Med Fleet was reduced to a handful of destroyers and cruisers. Image Yet during the second half of 1941, Malta's light cruisers and destroyers of Force K and B, u-class coastal submarines and Swordfish torpedo bombers had sunk 60% of Axis shipping supplying North Africa.

Keeping Malta in the fight was Cunningham's key to unlock victory. Image
May 9 24 tweets 9 min read
The Surface War - The FarEast, 1941-2 a 🧵..

From'39 the Eastern Fleet made do with a collection of hand-me downs and crocks, mostly to conduct convoy escort missions to Suez and Cape Town.

First World War vintage light cruisers and destroyers made up the bulk of fleet. Image By the end of 1940, they had been joined by the walking wounded from the Mediterranean war.

Ships damaged or with material flaws that could not be repaired at Alexandria.

These included the partially repaired cruisers Glasgow and Mauritius and the RAN's 'scrap Iron flotilla'. Image