Editing Napoleonic Wars (section)

===Scandinavia and Finland===
{{Main|Gunboat War|Finnish War|Dano-Swedish War of 1808–1809}}
[[File:Battle of Trangen.JPG|thumb|The [[Battle of Trangen]] during the [[Dano-Swedish War of 1808–1809|Dano–Swedish War, 1808–1809]]. The [[Norwegian Army|Norwegians]] fought bravely and defeated the Swedes.]]
Britain's first response to Napoleon's Continental System was to launch a major naval attack against [[Denmark-Norway|Denmark]]. Although ostensibly neutral, Denmark was under heavy French and Russian pressure to pledge [[Royal Danish Navy|its fleet]] to Napoleon. London could not take the chance of ignoring the Danish threat. In August 1807, the Royal Navy [[Battle of Copenhagen (1807)|besieged and bombarded Copenhagen]], leading to the capture of the [[History of the Danish navy|Dano–Norwegian fleet]], and assuring use of the sea lanes in the North and Baltic seas for the British merchant fleet. Denmark joined the war on the side of France, but without a fleet it had little to offer,{{sfn|Ryan|1953}}{{page needed|date=May 2021}}{{sfn|Munch-Petersen|2007}}{{page needed|date=May 2021}} beginning an engagement in a [[Gunboat War|naval guerrilla war]] in which small gunboats attacked larger British ships in Danish and Norwegian waters. Denmark also committed themselves to participate in a war against Sweden together with France and Russia.

At Tilsit, Napoleon and Alexander had agreed that Russia should force Sweden to join the Continental System, which led to a [[Finnish War|Russian invasion of Finland]] in February 1808, followed by a [[Dano-Swedish War of 1808–1809|Danish declaration of war]] in March. Napoleon also sent an auxiliary corps, consisting of troops from France, [[Kingdom of Spain (Napoleonic)|Spain]] and [[Kingdom of Holland|Holland]], led by Marshal [[Jean-Baptiste Bernadotte]], to Denmark to participate in the invasion of Sweden. But British naval superiority prevented the armies from crossing the [[Øresund]] strait, and the war came mainly to be fought along the Swedish–Norwegian border. At the [[Congress of Erfurt]] (September–October 1808), France and Russia further agreed on the division of Sweden into two parts separated by the [[Gulf of Bothnia]], where the eastern part became the Russian [[Grand Duchy of Finland]]. British voluntary attempts to assist Sweden with humanitarian aid remained limited, and did not prevent Sweden from adopting a more Napoleon-friendly policy.{{sfn|Götz|2014|pp=519–539}}{{page range too broad|date=May 2021}}

The war between Denmark and Britain effectively finished with a British victory at the [[Battle of Lyngør]] in 1812, involving the destruction of the last large Dano–Norwegian ship—the [[frigate]] ''[[HDMS Najaden (1811)|Najaden]]''.