Wednesday, May 15, 2019

Forking GIUK Gap


The invasion of Iceland (codenamed Operation Fork) by the Royal Navy and Royal Marines occurred on 10 May 1940, during WW2. The invasion took place because the British government feared that Iceland would be used by the Germans, who had recently overrun Denmark, which was in personal union with Iceland and which had previously been largely responsible for Iceland's foreign policy. The Government of Iceland issued a protest, charging that its neutrality had been "flagrantly violated" and "its independence infringed".

At the start of the war, the UK imposed strict export controls on Icelandic goods, preventing profitable shipments to Germany, as part of its naval blockade. The UK offered assistance to Iceland, seeking co-operation "as a belligerent and an ally", but the Icelandic government refused and reaffirmed its neutrality. The German diplomatic presence in Iceland, along with the island's strategic importance, alarmed the UK government.

After failing to persuade the Icelandic government to join the Allies, the UK invaded on the morning of 10 May 1940. The initial force of 746 Royal Marines commanded by Colonel Robert Sturges disembarked at the capital Reykjavík. Meeting no resistance, the troops moved quickly to disable communication networks, secure strategic locations, and arrest German citizens. Requisitioning local transport, the troops moved to Hvalfjörður, Kaldaðarnes, Sandskeið, and Akranes to secure potential landing areas against the possibility of a German counterattack.

The GIUK gap is an area in the northern Atlantic Ocean that forms a naval choke point. Its name is an acronym for Greenland, Iceland, and the United Kingdom, the gap being the open ocean between these three landmasses. The term is typically used in relation to military topics. The area has been considered strategically important since the beginning of the 20th century.

The GIUK gap is particularly important to the Royal Navy, as any attempt by northern European forces to break into the open Atlantic would have to be made either through the heavily defended English Channel, one of the world's busiest seaways, or through one of the exits on either side of Iceland. As the British also control the strategic port of Gibraltar at the entrance to the Mediterranean, this means Spain, France, and Portugal are the only Continental European countries that possess direct access to the Atlantic Ocean that cannot easily be blocked at a choke point by the Royal Navy.

From the start of WW2 in 1939, German ships used the gap to break out from their bases in northern Germany (and from occupied Norway after April 1940) with a view to attacking Allied shipping convoys, but Allied blocking efforts in the North Sea and in the GIUK gap impeded such break-outs. British forces occupied the Faroe Islands in April 1940, and Iceland in May 1940; the United States took over effective control of Greenland in 1940. But the German Kriegsmarine profited greatly from the fall of France in June 1940, after which German submarines could operate from bases on the French coast. Between 1940 and 1942, the Denmark Strait between Iceland and Greenland remained one of the few areas that RAF patrol bombers could not reach, and thus became the centre for considerable action.

The origin of the term "gap" dates to this period, when there was a gap in air coverage known as the Mid-Atlantic gap or the "Greenland air gap". This gap was an area that land-based aircraft could not reach and where, as a result, they could not carry out their anti-submarine duties. The air-surveillance gap eventually closed in 1943, when longer-ranged versions of aircraft such as the Short Sunderland and B-24 Liberator came into service.

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sī vīs pācem, parā bellum

igitur quī dēsīderat pācem praeparet bellum    therefore, he who desires peace, let him prepare for war sī vīs pācem, parā bellum if you wan...