View source for Plan R 4

{{Short description|World War II British plan for an invasion of Norway in April 1940}}
{{more footnotes needed|date=January 2021}}
{{Use dmy dates|date=October 2022}}
{{Use British English|date=November 2012}}
[[File:Map of Norway 1939.svg|thumb|Map of Norway in 1939]]
'''Plan R 4''' was an unrealised [[United Kingdom|British]] plan to invade [[Norway]] and [[Sweden]] in April 1940, during the [[Second World War]]. As a result of competing plans for Norway and a [[Operation Weserübung|German invasion of Norway]] the same month, it was not carried out as designed. Similar plans had been drawn up during the proposed [[Franco-British plans for intervention in the Winter War|Anglo-French intervention in the Winter War]].
==Background==
Germany did not have a sufficient domestic supply of [[iron]] ore, which is used in the production of [[steel]]. Before the war, large quantities of iron ore had been imported from mines in the [[France|French]] region of [[Lorraine]]. Since September 1939, that supply had no longer been available and so shipments from the other large supplier, [[Sweden]], were essential for the production of tanks, guns, ships, railcars, trucks and other implements of war.
In the northern part of the [[Baltic Sea]], the [[Gulf of Bothnia]], lies the Swedish port of [[Luleå]] from where in the summer a quantity of ore was shipped. It was frozen in winter and so for several months each year, the Swedes shipped most of their iron ore by rail through the [[ice-free port]] of [[Narvik]], in the far north of Norway. In a normal year, 80 per cent of the iron ore was exported through Narvik. The only alternative in winter was a long rail journey to [[Oxelösund]] on the [[Baltic Sea]], south of [[Stockholm]], which was not obstructed by ice. British intelligence suggested that Oxelösund could ship only a fifth of the weight that Germany required. Travelling inside Norwegian territorial waters for most of the trip, the shipping from Narvik was virtually immune to British interception. To Britain, stopping the shipping and thus starving German industry were vitally important.
[[File:Lapland1940.png|left|thumb|{{centre|Franco-British support was offered to [[Finland]], which had been invaded by the [[Soviet Union]], if it gave free passage through [[neutral country|neutral]] [[Norway]] and [[Sweden]], instead of taking the road from [[Pechengsky District|Petsamo]]. That was because of the wish to occupy the [[Swedish iron ore (WWII)|iron ore districts]] in [[Kiruna]] and [[Malmberget]]. (borders, 1920–1940)}}]]
The Allies devised a plan to use the [[Soviet Union]]'s 30 November 1939 [[Winter War|attack on Finland]] as a cover for seizing both the Swedish ore fields in the north and the Norwegian harbours through which it was shipped to Germany. The plan was to get Norwegian and Swedish permission to send an [[expeditionary warfare|expeditionary force]] to Finland across [[Sápmi]], ostensibly to help the Finns. Once there, they were to proceed to take control of Swedish harbours and mines, to occupy cities such as [[Gävle]] and Luleå and to end German access to Swedish ore, presenting Norway and Sweden with a [[fait accompli]]. Because of the danger of Allied or German occupation and of the war being waged on their territory, the Swedes and the Norwegians refused the transit requests.{{sfn|Ziemke|2000|pp=50–72}}
The Germans, having realised the Allied threat, were making plans for an invasion of Norway to protect their supply of iron ore. The [[Altmark Incident|''Altmark'' Incident]] of 16 February 1940 convinced Hitler that the Allies would not respect Norwegian neutrality and he ordered the plans for an invasion hastened. The Scandinavian reluctance to allow Allied troops on their territory halted the original Allied plan for using aid to Finland as a pretext for sending troops but on 12 March,{{citation needed|date=August 2015}} the Allies decided to try a "semi-peaceful". Troops were to be landed in Norway and were to proceed into Sweden to capture the Swedish mines. If serious military resistance from the Norwegians was encountered, the Allies were not to press the issue. Finland sued for peace on 13 March and the revised version of the plan was abandoned. The Germans knew something of the Allied plans. Intercepted radio traffic showed that Allied transport groups had been readied. Later interceptions informed Germany that the Allies had abandoned the plan and redeployed their forces. [[Adolf Hitler]] feared that the Allies would launch their invasion sooner or later and 9 April was set as the date of [[Operation Weserübung]], the German attack on [[Denmark]] and Norway.
== Plan ==
Britain had two parallel plans, [[Operation Wilfred]] and Plan R 4.
=== Operation Wilfred ===
Operation Wilfred, set to commence on 5 April (but delayed to 8 April), was a British naval operation intending to place two [[naval mine|minefields]] inside Norwegian territorial waters. Ships carrying ore would have to sail into international waters and run the gauntlet of the [[Royal Navy]], which could prevent the transport of [[Swedish iron ore]] to Germany. The Norwegian and the Swedish governments were to be publicly informed some days beforehand and to be accused of inability to uphold their neutrality.{{sfn|Ziemke|2000|pp=50–72}}
==== Plan R 4 ====
R 4 consisted of
* Stratford – the main British force (Scots Guards + AA) to occupy the area from Narvik to the Swedish border following the railway.
* Avonmouth (combined British and French force) – a raid to destroy the Sola airfield outside Stavanger and occupation of Bergen and Trondheim, the force comprising the main part of 146th and 148th Infantry Brigades plus a French Alpine brigade.
* Plymouth (British force) – consisting of the Hallamshire Battalion of the 146th Infantry Brigade to land at Trondheim and advance eastwards.{{sfn|Ziemke|2000|pp=50–72}}
According to Ziemke, it was hoped that Operation Wilfred would provoke a German reaction in the form of troop landings or threats thereof and R 4 was to be executed "the moment the Germans landed in Norway 'or showed they intended to do so.'"{{sfn|Claasen|2007|pp=114–135}} The first battalion transports were to sail within a few hours of the mines having been laid.{{sfn|Ziemke|2000|pp=50–72}} Claasen wrote that orders as "it is not intended that any Forces shall be landed in Norway until the Germans have violated Norwegian Territory, or there is clear evidence that they intend to do so".{{sfn|Claasen|2007|pp=114–135}} Both authors agree that the plan assumed the Norwegians would not actively resist the British forces.
== Aftermath ==
Plan R 4 could not be executed as planned, as most of the German navy was reported to be in Norwegian waters. Allied troops were swiftly sent to Norway to fight with the Norwegians but success was achieved only against the Germans in the Narvik area who were brought close to surrender. The Allied troops consisted of 24,500 British, Norwegian, French and Polish troops, in particular marine infantry, French Foreign Legionnaires and Polish mountain troops. The German troops were composed of 2,000 mountain troops and 2,600 seamen from the sunken German invasion flotilla. On 17 April 1940, Hitler ordered the German troops to evacuate to Sweden to be interned (see the [[Allied campaign in Norway]]). The [[Battle of France]] and the Low Countries led to an Allied troop redeployment. Allied troops were evacuated in [[Operation Alphabet]] from Narvik by 8 June 1940.
==See also==
* [[Franco-British plans for intervention in the Winter War]]
* [[Foreign support in the Winter War]]
* [[British occupation of the Faroe Islands in World War II]]
* [[Iceland during World War II]]
* [[Project Catherine]]
==Footnotes==
{{reflist|20em}}
==References==
{{refbegin}}
* {{cite journal |last1=Claasen |first1=Adam |title=The German Invasion of Norway, 1940: The Operational Intelligence Dimension |journal=Journal of Strategic Studies |volume=27 |issue=1 |year=2007 |issn=0140-2390 |doi=10.1080/0140239042000232792 |s2cid=153532724}}
* {{cite book |chapter-url=https://www.history.army.mil/books/70-7_02.htm |chapter=Chapter 2, The German Decision to Invade Norway and Denmark |title=Command Decisions |id=CMH Pub 70-7 |publisher=[[United States Army Center of Military History]] |first=Earl F. |last=Ziemke |url=https://www.history.army.mil/books/70-7_0.htm |year=2000 |orig-year=1960 |access-date = 19 August 2010 |archive-date=30 December 2007 |archive-url=https://web.archive.org/web/20071230145455/http://www.history.army.mil/books/70-7_0.htm |url-status=dead}}
{{refend}}
==Further reading==
* {{cite book |last=Butler |first=James |author-link=J. R. M. Butler |series=Britain and the Second World War – Military Series |title=Grand Strategy: September 1939 – June 1941 |volume=II |year=1971 |orig-year=1957 |publisher=[[HMSO]] |location=London |edition=2nd (amended) |isbn=0-11-630095-7}}
* {{cite book |first=T. K. |last=Derry |editor-last=Butler |editor-first=J. R. M. |editor-link=James Ramsay Montagu Butler |series=History of the Second World War, United Kingdom Military Series |title=The Campaign in Norway |url=http://www.ibiblio.org/hyperwar/UN/UK/UK-NWE-Norway/index.html#contents |publisher=[[HMSO]] |edition=Naval & Military Press |location=London |year=2004 |orig-year=1952 |isbn=1-845740-57-2}}
* {{cite book |last=Haarr |first=Geirr |title=The German Invasion of Norway, 1940 |year=2009 |publisher=Seaforth (Pen & Sword Books) |location=Barnsley |isbn=978-1-84832-032-1}}
* {{cite book |last=Haarr |first=Geirr |title=The Gathering Storm: The Naval War in Northern Europe September 1939 – April 1940 |year=2013 |publisher=Seaforth (Pen & Sword) |location=Barnsley |isbn=978-1-84832-140-3}}
* {{cite book |last=Lunde |first=Henrik O. |title=Hitler's Pre-Emptive War: The Battle for Norway, 1940 |year=2010 |publisher=Casemate |location=Havertown, PA and Newbury, Berks |isbn=978-1-935149-33-0}}
* {{cite book |last1=Maier |first1=Klaus A. |last2=Rohde |first2=Horst |last3=Stegemann |first3=Bernd |last4=Umbreit |first4=Hans |title=[[Germany and the Second World War]]: Germany's Initial Conquests in Europe |year=2015 |orig-year=1991 |publisher=Militärgeschichtliches Forschungsamt [Research Institute for Military History] |editor-last=Falla |editor-first=P. S. |edition=trans. pbk. Clarendon Press, Oxford |volume=II |location=Freiburg im Breisgau |language=en |translator-last=McMurry |translator-first=Dean S. |translator-last2=Osers |translator-first2=Ewald |isbn=978-0-19-873834-3}}
<!--** {{harvc |last=Stegemann |first=Bernd |c=Part V Securing the Northern Flank of Europe III. Operation Weserübumg |year=2015 |in1=Maier |in2=Rohde |in3=Stegemann |in4=Umbreit}}-->
* {{cite book |first1=Jürgen |last1=Rohwer |first2=Gerhard |last2=Hümmelchen |title=Chronology of the War at Sea, 1939–1945: The Naval History of World War Two |year=2005 |orig-year=1972 |publisher=Chatham |location=London |edition=3rd rev. |isbn=978-1-86176-257-3}}
* {{cite book |series=History of the Second World War United Kingdom Military Series: The War at Sea 1939–1945 |title=The Defensive |volume=I |last=Roskill |first=S. W. |author-link=Stephen Roskill |editor-last=Butler |editor-first=J. R. M. |editor-link=James Ramsay Montagu Butler |year=1957 |orig-year=1954 |publisher=HMSO |location=London |edition=4th impr. |url=http://www.ibiblio.org/hyperwar/UN/UK/UK-RN-I/index.html |oclc=881709135}}
{{World War II}}
[[Category:Military history of the United Kingdom during World War II]]
[[Category:Military operations directly affecting Sweden during World War II]]
[[Category:Cancelled invasions]]
[[Category:Cancelled military operations of World War II]]
[[Category:Norway–United Kingdom relations]]