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In page War of the Third Coalition:

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Historians differ on when the War of the Third Coalition began and when it ended[citation needed]. From the British perspective[citation needed], the war started when Britain declared war on France on 18 May 1803, but it was still on its own. It was not until December 1804 when Sweden entered into an alliance with the United Kingdom, not until 11 April 1805 when Russia joined the alliance, not until 16 July when Britain and Russia ratified their treaty of alliance, and only thereafter Austria (9 August) and Naples–Sicily (11 September) completed the fully-fledged coalition.