Lend-lease After
Operation Barbarossa, the German invasion of the
USSR, began on 22 June 1941, Britain and USSR signed an agreement in July that they would "render each other assistance and support of all kinds in the present war against Hitlerite Germany". Before September 1941 the British had dispatched 450 aircraft, of rubber, 3,000,000 pairs of boots and stocks of tin, aluminium, jute, lead and wool. In September British and US representatives travelled to Moscow to study Soviet requirements and their ability to meet them. The representatives of the three countries drew up a protocol in October 1941 to last until June 1942 and to agree new protocols to operate from 1 July to 30 June of each following year until the end of Lend-Lease. The protocol listed supplies, monthly rates of delivery and totals for the period. The first protocol specified the supplies to be sent but not the ships to move them. The USSR turned out to lack the ships and escorts and the British and Americans, who had made a commitment to "help with the delivery", undertook to deliver the supplies for want of an alternative. The main Soviet need in 1941 was military equipment to replace losses because, at the time of the negotiations, two large aircraft factories were being moved east from Leningrad and two more from Ukraine. It would take at least eight months to resume production, until when, aircraft output would fall from 80 to 30 aircraft per day. Britain and the US undertook to send 400 aircraft a month, at a ratio of three bombers to one fighter (later reversed), 500 tanks a month and 300
Bren gun carriers. The Anglo-Americans also undertook to send of aluminium and 3, 862 machine tools, along with sundry raw materials, food and medical supplies.
British grand strategy The growing German air strength in Norway and increasing losses to convoys and their escorts, led Rear-Admiral
Stuart Bonham Carter, commander of the
18th Cruiser Squadron, Admiral sir
John Tovey, Commander in Chief
Home Fleet and Admiral Sir
Dudley Pound the
First Sea Lord, the professional head of the
Royal Navy, unanimously to advocate the suspension of Arctic convoys during the summer months. The small number of Russian ships available to meet Arctic convoys, losses inflicted by based in Norway and the presence of the German battleship in Norway from early 1942, had led to a large number of ships full of supplies to Russia becoming stranded at the west end and empty and damaged ships waiting at the east end. Despite the views of the Navy, Churchill came under pressure from the president of the United States,
Franklin D. Roosevelt and the
Soviet leader,
Joseph Stalin, bowed to political reality and ordered the dispatch of a larger convoy to reduce the backlog,
Convoy PQ 13 had been the first convoy to suffer serious casualties, five ships being sunk by submarines, aircraft and surface ships. Tovey asked the Russians for more submarine patrols in the Barents Sea and more destroyer escorts for the final leg of the convoys. More escorts were diverted from
Western Approaches Command to increase the close escort to about ten vessels. Bomber Command had sent 33
Halifax heavy bombers to attack Tirpitz on 31 March in exceedingly poor weather, through which few aircraft managed to bomb. No hits were obtained and five of the Halifaxes were shot down. Convoy PQ 14 was considerably larger than earlier convoys.
Signals intelligence Ultra The British
Government Code and Cypher School (GC&CS) based at
Bletchley Park housed a small industry of code-breakers and
traffic analysts that intercepted and decoded German naval transmissions. By June 1941, the German
Enigma machine Home Waters () settings used by surface ships and U-boats could quickly be read. On 1 February 1942, the Enigma machines used in U-boats in the Atlantic and Mediterranean were changed but German ships and the U-boats in Arctic waters continued with the older ( from 1942, code-named Dolphin by the British). By mid-1941, British
Y-stations were able to read
wireless telegraphy (W/T) transmissions and give advance warning of Luftwaffe operations. In 1941, interception parties (code-named Headaches) embarked on warships. Enigma decrypts were used twice to tell Convoy PQ 14 that the big German ships had not sailed.
B-Dienst The rival German (, Observation Service) of the (MND, Naval Intelligence Service) had broken several Admiralty codes and cyphers by 1939, which were used to help
Kriegsmarine ships elude British forces and provide opportunities for surprise attacks. From June to August 1940, six British submarines were sunk in the Skaggerak using information gleaned from British wireless signals. In 1941, read signals from the Commander in Chief Western Approaches informing convoys of areas patrolled by U-boats, enabling the submarines to move into "safe" zones. had broken Naval Cypher No 3 in February 1942 and by March was reading up to 80 per cent of the traffic, which continued until 15 December 1943. By coincidence, the British lost access to the
Shark cypher and had no information to send in Cypher No 3 which might compromise Ultra. ====== In March 1942,
Adolf Hitler issued a directive for a greater anti-convoy effort to weaken the
Red Army and prevent
Allied troops being transferred to
northern Russia, preparatory to a landing on the coast of northern Norway. (
Hans-Jürgen Stumpff) was to be reinforced and the was ordered to put an end to Arctic convoys and naval incursions. The Luftwaffe and were to work together with a simplified command structure, which was implemented after a conference; the Navy had preferred joint command but the Luftwaffe insisted on the exchange of liaison officers. was to be reinforced by 2./
Kampfgeschwader 30 (KG 30) which was to increase its readiness for operations. A squadron of (Aufkl.Fl.Gr. 125) was transferred to Norway and more long-range
Focke-Wulf Fw 200 Kondor patrol aircraft from
Kampfgeschwader 40 (KG 40) were sent from France. At the end of March, the air fleet was divided. [
Alexander Holle], the largest command, was based at
Kirkenes with 2./
JG 5, 10.(
Z)/JG 5, 1./
StG 5 (Dive Bomber Wing 5) and 1. 124 [1./(F) 124] (1 Squadron, Long Range Reconnaissance Wing 124) charged with attacks on Murmansk and Archangelsk as well as attacks on convoys. Part of was based at
Petsamo (5./JG 5, 6./JG 5 and 3./
Kampfgeschwader 26 (3./KG 26),
Banak (2./KG 30, 3./KG 30 and 1./(F) 22) and Billefjord (1./Kü.Fl.Gr. 125). ( Hans Roth) was based at
Bardufoss but had no permanently attached units, which were added according to events. At the start of the anti-shipping campaign only the coastal patrol squadrons 3./ 906 at
Trondheim and 1./1./Kü.Fl.Gr. 123 at
Tromsø were attached to . was based at
Sola and was responsible for the early detection of convoys and attacks south of a line from Trondheim westwards to
Shetland and
Iceland, with 1./(F) 22, the of 1./KG 40, short-range coastal reconnaissance squadrons 1./ 406 (1./Kü.Fl.Gr. 406), 2./ 406 (2./Kü.Fl.Gr. 406) and a weather reconnaissance squadron.
Luftwaffe tactics As soon as information was received about the assembly of a convoy, would send long-range reconnaissance aircraft to search Iceland and northern Scotland. Once a convoy was spotted aircraft were to keep contact as far as possible in the extreme weather of the area. If contact was lost its course at the last sighting would be extrapolated and overlapping sorties would be flown to regain contact. All three were to co-operate as the convoy moved through their operational areas. would begin the anti-convoy operation east to a line from the North Cape to Spitzbergen Island, whence would take over using his and 's aircraft, which would to Kirkenes or Petsamo to stay in range. was not allowed to divert aircraft to ground support during the operation. As soon as the convoy came into range, the aircraft were to keep up a continuous attack until the convoy docked at Murmansk or Archangelsk. From late March to late May the air effort against convoys PQ 13, 14, 15 and convoys QP 9, 10 and 11 had little effect, twelve sinkings out of 16 lost in PQ convoys and two out of five sinkings from QP convoys being credited to the Luftwaffe; 166 merchant ships had sailed for Russia and 145 had survived the journey. Bad weather had been nearly as dangerous as the Luftwaffe but in April, the spring thaw grounded many Luftwaffe aircraft and in May bad weather led to contact being lost and convoys scattering, being impossible to find in the long Arctic night. When air attacks on convoys had taken place, the formations rarely amounted to more than twelve aircraft, greatly simplifying the task of convoy anti-aircraft gunners, who shot down several aircraft in April and May. Failings in liaison between the Luftwaffe and were uncovered and tactical co-operation greatly enhanced,
Hermann Böhm () noting that in the operation against Convoy PQ 15 and Convoy QP 11, there were no problems in co-operation between aircraft, submarines and destroyers. From 152 aircraft in January, reinforcements to 5 increased its strength to 221 front-line aircraft by March 1942.
Air-sea rescue The
Luftwaffe Sea Rescue Service () along with the , the
Norwegian Society for Sea Rescue (RS) and ships on passage, recovered aircrew and shipwrecked sailors. The service comprised at
Stavanger covering Stavanger, Bergen and Trondheim and at Kirkenes for Tromsø, Billefjord and Kirkenes. Co-operation was as important in rescues as it was in anti-shipping operations if people were to be saved before they succumbed to the climate and severe weather. The sea rescue aircraft comprised
Heinkel He 59 floatplanes,
Dornier Do 18 and
Dornier Do 24 seaplanes. (OKL, the high command of the Luftwaffe) was not able to increase the number of
search and rescue aircraft in Norway, due to a general shortage of aircraft and crews, despite Stumpff pointing out that coming down in such cold waters required extremely swift recovery and that his crews "must be given a chance of rescue" or morale could not be maintained. After the experience of PQ 16, Stumpff gave the task to the coastal reconnaissance squadrons, whose aircraft were not usually engaged in attacks on convoys. They would henceforth stand by to rescue aircrew during anti-shipping operations. ==Prelude==