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Britain and France were finding that their war against Imperial Russia in the Crimea was going nowhere fast. The longed to open a second front and thus force a conclusion to the war. A decision had been reached to bring the war into the Baltic. However, the British and the French both knew that for any realistic chance at success they would need additional help. It was thus decided to approach the Kingdom of Sweden to see what arrangement could be made to gain the active support of Sweden into the War.
There were some in the government and the Monarchy that wish to see the Kingdom regain its Finnish province. Thus the price for Sweden'sfull support of the war would be an agreement that Britain and France would demand that Finland be restored to Sweden. That there would be no peace without that.
The British Government reluctantly agreed as it saw the move as a means of ending the war much quicker. France also agreed.
With the agreement Sweden mobilized its military and together with the Royal Navy it was transported to Finland.