90th Heavy Anti-Aircraft Regiment, Royal Artillery

The 90th Heavy Anti-Aircraft Regiment, Royal Artillery was an air defence regiment of Britain's Territorial Army (TA) formed in the London suburbs of Middlesex during the period of international tension leading up to the outbreak of World War II. It defended London during the Battle of Britain and the Blitz of 1940–41 and later served in the campaign in North West Europe. The unit continued in the postwar Territorial Army until it was disbanded in 1955.

Origin

In 1935 the increasing need for anti-aircraft (AA) defence, particularly for London, was addressed by converting a number of London infantry battalions of the Territorial Army (TA) to the AA role. One of these was the 11th London Regiment (Finsbury Rifles), which was transferred to the Royal Artillery (RA) as the 61st (Finsbury Rifles) Anti-Aircraft Brigade.''Monthly Army List'', various dates.Litchfield, p. 177. By 1938 the brigade comprised one light AA (LAA) and three heavy AA (HAA) batteries at Finchley and Pentonville. The TA was rapidly expanded after the Munich Crisis, and in October 1938 the brigade ('regiment' from 1 January 1939) formed an additional heavy battery (272nd AA Bty) at Southgate. In early 1939 the TA was doubled in size, and on 1 April 1939 the 272nd Battery left to form the basis of a new 90th Anti-Aircraft Regiment, RA, with its Regimental Headquarters (RHQ), 272nd, 284th, and 285th AA Batteries all at Southgate, Middlesex. It was under the command of Brevet Colonel H.A.D. Murray, TD.Frederick, pp. 756–60, 777.'AA Command – Middlesex' at Stepping Forward London.90 HAA Rgt at RA 39–45.
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Initially, the new regiment formed part of the 37th AA Brigade. By the outbreak of World War II this was under the 6th AA Division of AA Command which was defending the approaches to London.

World War II

Mobilisation

In June 1939, as the international situation worsened, a partial mobilisation of the TA was begun in a process known as 'couverture', whereby each AA unit did a month's tour of duty in rotation to man selected AA gun positions. Full mobilisation of AA Command came in August 1939, ahead of the declaration of war on 3 September 1939. 37 AA Brigade deployed and operated a gun layout from Dagenham to Thorpe Bay in Essex, along the north side of the Thames Estuary, known as 'Thames North'. This had a planned layout of 20 HAA sites, however only half were occupied by September 1940.

Opportunities for action were rare during the Phoney War, but on the night of 22/23 November 1939 the HAA guns of Thames North combined with those of 28th (Thames & Medway) AA Bde on the other bank of the estuary ('Thames South') to engage at least two enemy mine-laying aircraft that had strayed into the mouth of the Estuary. One wrecked aircraft was found on the marshes.

On 1 June 1940, all the RA units equipped with the older 3-inch or newer 3.7-inch AA guns were designated as Heavy AA (HAA) regiments to distinguish them from the newer Light AA (LAA) regiments appearing in the order of battle.

Battle of Britain

All the guns of Thames North were heavily engaged throughout the Battle of Britain. On 22 August, for example, a mass raid flew up the Thames Estuary to attack RAF Hornchurch on the Essex shore; the raid was broken up by 37 and 28 AA Bdes, and then the fighters of No. 11 Group RAF attacked. Follow-up raids were marked for the fighters by 'pointer' rounds of HAA fire. On 2 September another mass raid arrived over the Medway and flew up the Thames towards Hornchurch. They came under heavy fire from the 3.7s and 4.5s of 28 and 37 AA Bdes and 15 were shot down before the fighters took over. On 7 September heavy raids up the estuary attacked oil wharves at Thameshaven, Tilbury Docks and Woolwich Arsenal: a total of 25 aircraft were destroyed by AA guns and fighters.Routledge, pp. 385–6.

On 15 September, remembered as the climax of the battle, 220 bombers attacked London in the morning despite heavy casualties inflicted by the RAF fighters. More attacks came in the afternoon and the AA guns around London, particularly 37 AA Bde, were continuously in action, breaking up the bomber formations. Between the guns and fighters, the ''Luftwaffe'' lost 85 aircraft that day, an unsustainable rate of loss.Farndale, p. 110.Collier, Chapter XV.
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The Blitz

After 15 September the intensity of Luftwaffe day raids declined rapidly, and it began a prolonged night bombing campaign over London and industrial towns (The Blitz). This meant that the Thames North and South AA guns were in action night after night as the bomber streams approached the London Inner Artillery Zone, but even with the assistance of searchlights, the effectiveness of HAA fire and fighters was greatly diminished in the darkness.

By November, 90th HAA Rgt had been transferred across the estuary to reinforce 28 AA Bde in Thames South. This had a planned layout of 25 HAA sites (of which only 16 were occupied) running from Dartford to Chatham, Kent, where there was a strongly defended area around the naval dockyards at Chatham and Sheerness and the aircraft factory at Rochester. This was controlled from a Gun Operations Room (GOR) at Chatham. As well as bomber streams passing over towards the London Inner Artillery Zone (IAZ), the Chatham area was also subjected to minor attacks.

Mid-war

The Blitz ended in May 1941 but 90th HAA Rgt remained in 28 AA Bde for the next year.Order of Battle of Non-Field Force Units in the United Kingdom, Part 27: AA Command, 14 May 1942, with amendments, TNA file WO 212/81. It had sent a cadre to 205th HAA Training Regiment at Arborfield to provide the basis for a new 394 Bty; this was formed on 12 December 1940 and joined the regiment on 17 March 1941 The regiment sent another cadre to 206th HAA Training Regiment at Arborfield to form 445 HAA Bty on 12 June 1941; this later joined 129th HAA Rgt. A further cadre went to 211th HAA Training Regiment at Oswestry to form 494 (Mixed) HAA Bty on 26 November 1941, which joined 143rd (Mixed) HAA Rgt. ('Mixed' units were those into which women of the Auxiliary Territorial Service were integrated.) A final cadre went to 205th HAA Training Rgt to form 535 (M) HAA Rgt on 19 February 1942, which joined 156th (M) HAA Rgt.

From 1942 many of AA Command's experienced units were transferred to War Office (WO) control, trained and equipped for mobile warfare in active theatres overseas. 90th HAA Regiment was one of those selected and converted to the three-battery establishment for overseas service; 394 HAA Battery left on 10 July 1942, transferring to a newly formed 164th HAA Rgt. 90th HAA Regiment then left 28 AA Bde later that month. In the autumn it joined 71 AA Bde in 2 AA Group (a new formation that had taken over from 6 AA Division), but left AA Command entirely in early 1943 to come under WO Control in March, with the following organisation:
* RHQ
* 272, 284, 285 HAA Btys
* 90 HAA Signal Detachment, Royal Corps of Signals
* 90 HAA Workshop, Royal Electrical and Mechanical Engineers

By July 90th HAA was designated as a mobile regiment in 21st Army Group, training for the planned Allied invasion of Normandy (Operation Overlord).

North West Europe

Operation Overlord began with D Day on 6 June 1994, but in late June the regiment was still in England with 100 AA Bde, waiting to be called for embarkation. As 100 AA Bde's units arrived in Normandy, they were at first placed under the command of 80 AA Bde, tasked with defending the eastern end of the beachhead. However, by July the Luftwaffe was reduced to sporadic raids, and the HAA regiments, including 90th HAA, were frequently used to supplement the medium artillery in bombarding ground targets, counter-battery (CB) fire, and anti-tank roles in the bitter fighting round Caen

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