Early War

The group was reformed on 15 March 1939 as No. 15 (Reconnaissance) Group, part of RAF Coastal Command, at Lee-on-Solent.^[1] It comprised Royal Air Force squadrons, with attached Naval Air Squadrons from the Royal Navy's Fleet Air Arm, operating under Royal Air Force control.^[3] No. 15 Group relocated its headquarters to Mount Wise, Plymouth, on 6 June 1939. By November 1939, No. 15 Group, under Air Commodore Rey Griffith Parry, DSO,^[4] had expanded to ten units operating across six Royal Air Force stations. It had three squadrons equipped with Short Sunderland flying boat patrol bomber. Two, Nos. 210 and 228 Squadrons, were stationed at RAF Pembroke Dock, in Pembrokeshire, Wales, with the third squadron, No. 204, operating out of RAF Mount Batten, in Devon, England. The group had two units operating with Avro Anson, a twin-engined multi-role aircraft, across four stations, No. 502 Squadron, was based at RAF Aldergrove, in Northern Ireland and which also had a detachment at RAF Hooton Park, in Cheshire, England, and No. 217 Squadron, based at RAF St Eval, in Cornwall, England, which also operated a flight out of RAF Carew Cheriton, situated in Pembrokeshire, Wales.^[5] No. 3 and No. 5 Coastal Patrol Flights, both equipped with de Havilland Tiger Moth, a biplane trainer aircraft, and de Havilland Hornet Moth, a cabin biplane, were based at RAF Hooton Park and RAF Carew Cheriton respectively.^[6][5]

The following year, in August 1940, the headquarters moved to Egg Buckland Keep, and a final move in early 1941 saw it transfer to Derby House, Liverpool.^[7] Its squadrons provided support and convoy escorts, maritime reconnaissance and anti-submarine warfare in the South West, Western Approaches and the Irish Sea. Air Vice-Marshal James Robb was appointed Air Officer Commanding, replacing Air Commodore Rey Griffith Parry, on 23 February 1941.^[1]

Flight Lieutenant A W Fraser and his crew, stand in front of their Consolidated Liberator Mark I, AM929 'H', of No. 120 Squadron RAF, at Reykjavik, Iceland, after sinking the German type IXD2 submarine U-200 on 24 June 1943

On 9 April 1941 it took control of Royal Air Force units in Iceland. It continued to operate from Liverpool for the rest of the Second World War.^[1] By May 1941, No. 210 Squadron had moved to RAF Oban, located in Argyll and Bute, Scotland. It operated with Short Sunderland but was re-equipping to Consolidated Catalina. No. 502 Squadron was now operating with Armstrong Whitworth Whitley, a medium bomber, and was based alongside No. 211 Squadron, equipped with Vickers Wellington, a long-range medium bomber, at RAF Limavady, near the city of Derry, Northern Ireland. At RAF Lough Erne, in County Fermanagh, Northern Ireland, Nos. 209 and 240 Squadrons both operated with Consolidated Catalina, but were also equipped with Saunders-Roe Lerwick and Supermarine Stranraer respectively.^[8] No. 119 Squadron had reformed at RAF Bowmore, Strathclyde, Scotland, on 13 March 1941 as part of No. 15 Group. The squadron was equipped with three Short G class and two Short C class flying boats.^[9] RAF Hooton Park was home to the Group Communications Flight,^[8] which operated various types and marks of aircraft,^[10] and also home to a No. 48 Squadron flight which was formed of Avro Anson. The squadron also had a similar flight at RAF Port Ellen, on the island of Islay in Argyll and Bute. RAF Aldergrove was home to No. 233 Squadron, equipped with Lockheed Hudson and No. 252 Squadron which operated with Bristol Beaufighter.^[8]

An aircrew sergeant of No. 209 Squadron RAF about to launch a carrier pigeon from the side hatch of a Saro Lerwick flying boat

On 4 April 1942, Air Vice-Marshal Douglas Colyer become the new Air Officer Commanding for No. 15 Group.^[1] Around this time the Group Communications Flight continued at RAF Hooton Park. The Coastal Command Development Unit RAF, which was set up to undertook service trials of all radar equipment, was operating under No. 15 Group and the unit was working out of RAF Ballykelly, located in County Londonderry, Northern Ireland. RAF Aldergrove was home to four of No. 15 Groups units: No. 206 Squadron, equipped with Lockheed Hudson, No. 143 Squadron, which operated with Bristol Beaufighter, No. 1402 (Meteorological) Flight, which used Supermarine Spitfire, Lockheed Hudson and Gloster Gladiator, and No. 1 Armament Practice Camp,^[11] which had formed out of No. 15 Group Armament Practice Camp on 5 November 1941 and was equipped with various aircraft including Westland Lysander, an army co-operation and liaison aircraft.^[12]

No. 224 Squadron, which operated with Lockheed Hudson, was based at RAF Limavady. No. 15 Group was now down to two Short Sunderland squadrons, No. 228 Squadron, based at RAF Stornoway, on the Isle of Lewis, in the Western Isles of Scotland, and No. 201 Squadron based in Northern Ireland, at RAF Lough Erne, which was also home to No. 240 Squadron, which was equipped with Consolidated Catalina. Also in Northern Ireland were Nos. 120 and 220 Squadrons, which operated from RAF Nutts Corner, in County Antrim and were equipped with Consolidated Liberator and Boeing Fortress, both types being American four-engined heavy bomber aircraft, respectively.^[11]

A Royal Air Force Liberator Mark I (serial AM910) on the ground following conversion as an anti-submarine aircraft by Scottish Aviation Ltd, AM910 joined No. 120 Squadron at Nutts Corner, County Antrim, Northern Ireland (UK), as "OH-M"

Mid and later war

One year later, by April 1943, Air Vice-Marshal Leonard Slatter was in command of the group. The Group Communications Flight had by this time relocated to RAF Speke, located in Liverpool. No. 15 Group now controlled five squadrons of Short Sunderland flying boats. Three squadrons, 201, 228 and 423 operated out of RAF Castle Archdale (previously known as RAF Lough Erne). No. 246 Squadron which was based at RAF Port Ellen, and No. 330 Squadron which was at RAF Oban. Also at Oban was No. 422 Squadron which was controlled by No. 15 Group and equipped with Consolidated Catalina. No. 15 Group had two Boeing Fortress units, both were based at RAF Benbecula, on the island of Benbecula in the Outer Hebrides, in Scotland, with Nos. 206 and 220 Squadrons. RAF Aldergrove was home to three units with No. 1 Armament Practice Camp, No. 1402 (Meteorological) Flight, equipped with Gloster Gladiator, Supermarine Spitfire and Handley Page Hampden, a medium bomber, and No. 120 Squadron, which operated with Consolidated Liberator. At RAF Ballykelly, No. 280 Squadron operated a detachment of Avro Anson.^[13]

Castle Archdale (formerly Logh Erne) in Northern Ireland on 20 May 1943, as a seaplane tender passes a Sunderland of No 201 Squadron

Around July 1944, No. 15 Group had reduced down in size and now consisted nine units across five RAF stations, including the Group Communications Flight at RAF Speke. RAF Aldergrove was home to the meteorological flight, and No. 1 Armament Practice Camp. It was now back to just two Short Sunderland units which were based at RAF Castle Archdale, these were the RCAFs Nos 422 and 423 Squadrons. The group had two Consolidated Liberator squadrons, Nos 59 and 120, which were operating out of RAF Ballykelly. In Scotland, RAF Tiree on the island of Tiree in the Inner Hebrides, was home to No. 518 Squadron which was equipped with Handley Page Halifax, a four-engined heavy bomber, and No. 281 Squadron which used Vickers Warwick, a maritime reconnaissance, air-sea rescue and transport aircraft.^[14]

A convoy seen from 'X for X-Ray', a No 120 Squadron Liberator based at Aldergrove. The aircraft made contact after a flight of several hours at low-level to avoid icing conditions in the clouds. For a further three hours it patrolled out to the front and rear of the convoy, also keeping an eye on stragglers, but there was no sign of any U-boats

Air Commodore Norman Pritchett had been appointed Air Officer commanding for No. 15 Group, during June 1945^[1] and by July it was in control of seven units across seven RAF stations. RAF Speke remained home to the Group Communications Flight. The group controlled No. 518 Squadron, equipped with Handley Page Halifax and based at RAF Tiree.^[15] Also at Tiree was a detachment from No. 281 Squadron providing air sea rescue, using both Vickers Warwick, and Supermarine Sea Otter , an amphibious aircraft. The squadron also had a similar detachment at RAF Valley, on the island of Anglesey, Wales.^[16] The remainder of the group’s assets were based within Northern Ireland. No. 1 Armament Practice Camp remained at RAF Aldergrove. The group controlled No. 1402 (Meteorological) Flight, which used Supermarine Spitfire and Hawker Hurricane and operated out of RAF Ballyhalbert, situated in County Down, and No. 201 Squadron, equipped with Short Sunderland, at RAF Castle Archdale. No. 281 Squadron was based at RAF Limavady, providing air sea rescue like its detachments. Also at Limavady, as part of No. 15 Group, was the Coastal Command Anti U-Boat Devices School RAF,^[15] which had previously existed under different identities since 1940, and was equipped with Vickers Wellington VIII.^[17]

No. 15 Group disbanded on 1 August 1945 and was absorbed into RAF Northern Ireland.^[1]