‘The 24th of July 1905 is a cornerstone in European politics’, Kaiser Wilhelm II declared in a letter to Tsar Nicholas II of Russia on the 27th of the same month, ‘and turns over a new leaf in the history of the world’. The occasion to which Wilhelm referred was the signing of a treaty of alliance between Germany and Russia by himself and Nicholas at Björkö, off the southern coast of Finland. The treaty, although restricted to Europe, would have had the effect of neutralising the Dual Alliance between France and Russia which had been concluded in 1894, thus freeing Germany from the danger of a war on two fronts. In addition, it was designed to pave the way for a continental league, involving the participation of all the Great Powers of the European mainland, including France, against the British Empire. The aim of the treaty was therefore to effect a diplomatic revolution that would have left Germany with de facto mastery of the European continent. The Kaiser would have achieved the objective that he had set himself early in his reign, when he had declared to his closest friend and political confidant Philipp Count zu Eulenburg-Hertefeld that the ‘fundamental principle’ of his European policy was ‘leadership in the peaceful sense – a sort of Napoleonic supremacy’. Wilhelm was therefore correct in relation to the potential importance of the agreement which he had concluded with the Tsar.