page_title: No. 90 Squadron RAF
section_title: World War II
hierarchical_section_title: No. 90 Squadron RAF / History / World War II
caption_attribution_description: English: The crew of a Boeing Fortress Mk I of No. 90 Squadron RAF putting on electrically-heated flying suits at Polebrook, Northamptonshire, before taking off for a high-altitude bombing attack on the German battlecruiser GNEISENAU at Brest, France.
context_page_description: No. 90 Squadron RAF is a squadron of the Royal Air Force.
context_section_description: The squadron reformed at RAF Bicester on 15 March 1937 from a flight of 101 Squadron, as a light bomber squadron equipped with Hawker Hind biplanes as its initial equipment. It replaced its Hinds with the more modern Bristol Blenheim twin-engined monoplane from May that year. It replaced its Blenheim Is with Blenheim Mark IVs in early 1939, and on the outbreak of the Second World War, became a training squadron, training Blenheim crews for the rest of Bomber Command. It disbanded on 4 April 1940 when it merged with No. 35 Squadron to become part of No. 17 OTU.
  The squadron reformed once more at RAF Watton on 7 May 1941 as Bomber Command's only unit equipped with the American Boeing Fortress I four-engined heavy bomber, moving to West Raynham on 15 May. 90 Squadron flew its first operational mission on 8 July 1941, when three Fortresses set off from RAF Polebrook to attack Wilhelmshaven (although only two of them actually managed to bomb the target). The squadron typically flew small formations of Fortresses in high altitude daylight attacks, taking part in a large scale attack on the German battleship Gneisenau at Brest, France on 24 July. Three Fortresses attacked were to attack from 30,000 ft (9,100 m), with the objective of drawing German fighters away from 18 Handley Page Hampdens attacking at lower altitudes. A larger force of 79 Vickers Wellingtons would attack later, while the fighters were meant to be refuelling. The operation did not work as expected, with 90 Squadron's Fortresses being unopposed, with the German defenders concentrating on the Hampdens and Wellingtons, shooting down two and ten respectively. Small scale attacks continued, with four Fortresses attacking the German "pocket battleship" Admiral Scheer at Oslo harbour on 8 September, losing two of their number to German fighters. 90 Squadron flew its final operational mission over northern Europe on 25 September 1941. In 51 operational sorties, 25 were abandoned due to faults with the aircraft, with 50 tons of bombs being dropped, of which only about 1 ton hit the intended targets. The Fortress I was unsuitable for the type of very high-altitude operations by small formations on which the RAF used them. Four aircraft were dispatched to Egypt in November for operations in support of the Western Desert Campaign, with the two survivors becoming a detachment of 220 Squadron in December. The squadron surrendered its remaining Fortresses to 220 Squadron in February 1942, with the squadron flying a few Blenheims until it disbanded on 14 February 1942.
  On 7 November 1942 the Squadron again reformed as a night bomber squadron, part of No. 3 (Bomber) Group, at RAF Bottesford. It was to be equipped with the  Short Stirling Mk.I, receiving its first Stirling on 1 December and moving to RAF Ridgewell on 29 December 1942. Its first operational venture were  mining sorties on 8 January 1943.
  The months following saw the Stirling Mk.III (an improved version) introduced to the Squadron, which moved to RAF Wratting Common on 31 May 1943. As a three-flight unit, the squadron was capable of providing 24 aircraft to the Group's Operational Battle Order, with a further six aircraft held in immediate reserve, and a total of 33 crews. The unit's resources were thrown into the Battle of the Ruhr and sent to many of the German targets that were most heavily defended, including Berlin. The Squadron suffered considerable losses over an eight-month period and found it difficult to maintain reserves of men and machines.
  The Stirlings suffered from deficiencies in design, due to restrictions laid down in the original Air Ministry specifications. After suffering heavy proportionate losses by type, their operations were restricted to Special Duties i.e.: Dropping sea mines, low level supply dropping to the Maquis, shorter bombing raids on invasion objectives. The Squadron was active on all these fronts.
  By June 1944 the Squadron had been declared operational on Lancasters.
  The last raid was to Bremen on 22 April 1945, the squadron flew 4,613 operational sorties for Bomber Command du
caption: 90 Squadron Fortress crew at RAF Polebrook before an attack on the German battleship Gneisenau at Brest, France
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