Anglo-Polish military alliance
The Anglo-Polish military alliance refers to the alliance between the United Kingdom and the Polish Second Republic formalised by the Anglo-Polish Agreement in 1939 and subsequent addenda of 1940 and 1944, for mutual assistance in case of military invasion by Germany
British Guarantee to Poland
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On March 31, 1939, in response to Nazi Germany's defiance of the Munich Agreement and occupation of Czechoslovakia, the United Kingdom pledged the support of itself and France to guarantee Polish independence.
... in the event of any action which clearly threatened Polish independence, and which the Polish Government accordingly considered it vital to resist with their national forces, His Majesty's Government would feel themselves bound at once to lend the Polish Government all support in their power. They have given the Polish Government an assurance to this effect.
I may add that the French Government have authorised me to make it plain that they stand in the same position in this matter as do His Majesty's Government.
Polish-British Common Defence Pact
On August 25, two days after the Nazi-Soviet Pact, the Agreement of Mutual Assistance between the United Kingdom and Poland was signed. The agreement contained promises of mutual military assistance between the nations in the event either was attacked by some "European country". The United Kingdom, sensing a dangerous trend of German expansionism, sought to prevent German aggression by this show of solidarity. In a secret protocol of the pact, the United Kingdom offered assistance in the case of an attack on Poland specifically by Germany, while in the case of attack by other countries the parties were required to "consult together on measures to be taken in common". Both the United Kingdom and Poland were bound not to enter agreements with any other third countries which were a threat to the other. Because of the pact's signing, Hitler postponed his planned invasion of Poland from August 26 until September 1.
At the time Adolf Hitler was demanding the cession of the port of Danzig, an extraterritorial highway (the Reichsautobahn Berlin-Königsberg) across the Polish Corridor, and special privileges for the German minority within Poland. By the terms of the military alliance, each party (i.e. Poland and Britain) was free to decide whether to oppose with force any territorial encroachment, as the pact did not include any statement of either party's commitment to the defence of the other party's territorial integrity. The Pact did contain provisions regarding "indirect threats" and attempts to undermine either party's independence by means of "economic penetration", a clear reference to the peculiar status of Danzig. Fearing all-out German invasion no matter what, Poland rejected the German demands.
The British and French governments had plans other than fulfilling their treaties with Poland. On May 4, a meeting was held in Paris at which it was decided that "the fate of Poland depends on the final outcome of the war, which will depend on our ability to defeat Germany rather than to aid Poland at the beginning." Poland's government was not notified of this decision, and the Polish-British talks in London were continued. Also in May 1939, Poland signed a secret protocol to the 1921 Franco-Polish Military Alliance, but it was not ratified by the French until September 4.
On September 17 the Soviet Union invaded Poland through the eastern Polish border. According to the Polish-British Common Defence Pact, the United Kingdom should give Poland “all the support and assistance in its power” if Poland was "engaged in hostilities with a European Power in consequence of aggression by the latter". The Polish ambassador in London, Raczyński, contacted the British Foreign Office pointing out that clause 1(b) of the agreement which concerned an "aggression by a European power" on Poland, should apply to the Soviet invasion. The Foreign Secretary Lord Halifax responded that the obligation of British Government towards Poland arising out of the Anglo-Polish Agreement, was restricted to Germany, according to the first clause of the secret protocol.
- Lerski, Jerzy Jan (1996). Historical Dictionary of Poland, 966-1945. Greenwood Publishing Group. ISBN 9780313260070.
- Paul W. Doerr. 'Frigid but Unprovocative': British Policy towards the USSR from the Nazi-Soviet Pact to the Winter War, 1939. Journal of Contemporary History, Vol. 36, No. 3 (Jul., 2001), pp. 423-439
- Keith Sword. British Reactions to the Soviet Occupation of Eastern Poland in September 1939. The Slavonic and East European Review, Vol. 69, No. 1 (Jan., 1991), pp. 81-101.
- Martin Collier, Philip Pedley. Germany, 1919-45
- Statement by the Prime Minister in the House of Commons on March 31, 1939.
- Andrew J. Crozier. The Causes of the Second World War, pg. 151
- Michael G. Fry, Erik Goldstein, Richard Langhorne. Guide to International Relations and Diplomacy
- Prazmowska, Anita J. (2004). Britain, Poland and the Eastern Front, 1939. Cambridge Russian, Soviet and Post-Soviet Studies Soviet and East European Studies. Volume 53. Cambridge University Press. p. 203. ISBN 9780521529389.
- Jerzy Jan Lerski. Historical Dictionary of Poland, 966-1945, pg. 49
- Frank McDonough. Neville Chamberlain, Appeasement and the British Road to War, pg. 86
- "On 31 March 1939 the British government guaranteed the independence (though not the territorial integrity) of Poland, in which they were joined by France."
Paul M. Hayes, 'Themes in Modern European History, 1890-1945', Routledge (1992), ISBN 0-415-07905-5
- Agreement of Mutual Assistance Between the United Kingdom and Poland.-London, August 25, 1939.
- (English) Count Edward Raczyński (1948). The British-Polish Alliance; Its Origin and Meaning. London: Mellville Press.
- Piotr Zychowicz, Pakt Ribbentrop - Beck. Dom Wydawniczy Rebis, Poznań 2012. ISBN 978-83-7510-921-4