Hannover wrote:The treaty with Poland was to 'defend it against ALL 'aggression'
Well, not really:
»Agreement of Mutual Assistance between the United Kingdom and Poland, August 25, 1939.
THE Government of the United Kingdom of Great Britain and Northern Ireland and the Polish Government:
Desiring to place on a permanent basis the collaboration between their respective countries resulting from the assurances of mutual assistance of a defensive character which they have already exchanged:
Have resolved to conclude an Agreement for that purpose and have appointed as their Plenipotentiaries:
The Government of the United Kingdom of Great Britain and Northern Ireland:
The Rt. Hon. Viscount Halifax, K.G., G.C.S.I., G.C.I.E., Principal Secretary of State for Foreign Affairs;
The Polish Government:
His Excellency Count Edward Raczynski, Ambassador Extraordinary and Plenipotentiary of the Polish Republic in London;
Who, having exchanged their Full Powers, found in good and due form, have agreed following provisions:-
ARTICLE I.
Should one of the Contracting Parties become engaged in hostilities with a European Power in consequence of aggression by the latter against that Contracting Party, the other Contracting Party will at once give the Contracting Party engaged in hostilities all the support and assistance in its power.
ARTICLE 2.
(1) The provisions of Article I will also apply in the event of any action by a European Power which clearly threatened, directly or indirectly, the independence of one of the Contracting Parties, and was of such a nature that the Party in question considered it vital to resist it with its armed forces.
(2) Should one of the Contracting Parties become engaged in hostilities with a European Power in consequence of action by that Power which threatened the independence or neutrality of another European State in such a way as to constitute a clear menace to the security of that Contracting Party, the provisions of Article I will apply, without prejudice, however, to the rights of the other European State concerned.
[...]
Secret Protocol attached to the Agreement of Mutual Assistance between the United Kingdom and Poland signed on the 25th August 1939
The Government of the United Kingdom and Northern Ireland and the Polish Government are agreed upon the following interpretation of the Agreement of Mutual Assistance signed this day as alone authentic and binding.
1. (a) By the expression "a European Power" employed in the Agreement is to be understood Germany. (b) In the event of action within the meaning of Article 1 or 2 of the Agreement by a European Power other than Germany, the Contracting Parties will consult together on the measures to be taken in common.
2. (a) The two Governments will from time to time determine by mutual agreement the hypothetical cases of action by Germany coming within the ambit of Article 2 of the Agreement. (b) Until such time as the two Governments have agreed to modify the following provisions of this paragraph, they will consider: that the case contemplated by paragraph (1) of the Article 2 of the Agreement is that of the Free City of Danzig; and that the cases contemplated by paragraph (2) of Article 2 are Belgium, Holland, Lithuania. [...]»
http://en.wikisource.org/wiki/Agreement ... %281939%29
At the End of September 1939 the Under-Secretary for Foreign Affairs, R. A. Butler, declared in the House of Commons that the British guarantee for Poland had only been binding Britain in case of a German aggression [Heinz Lehmann, »Englands Spiel mit Polen. Die englisch-polnischen Beziehungen seit dem Weltkrieg«, p. 7].