The Treaty of Saint Petersburg was signed on 11 April 1805 by Great Britain and the Russian Empire and created an offensive alliance directed against Napoleon's French Empire.
[1] The two allies were joined by Austria on 9 August 1805 and by Sweden on 3 October 1805 while France was allied to Spain and a number of France's satellite republics.
Sweden joined only after Britain granted subsidies that financed almost all Swedish war costs.
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