Dano-Swedish War of 1808–1809: The Battle of Trangen took place at Trangen in Flisa, Hedemarkens Amt, between Swedish and Norwegian troops.

The Dano-Swedish War of 1808–1809 was a war between Denmark–Norway and Sweden due to Denmark–Norway's alliance with France and Sweden's alliance with the United Kingdom during the Napoleonic Wars. Neither Sweden nor Denmark-Norway had wanted war to begin with but once pushed into it through their respective alliances, Sweden made a bid to acquire Norway by way of invasion while Denmark-Norway made ill-fated attempts to reconquer territories lost to Sweden in the 17th century. Peace was concluded on grounds of status quo ante bellum on 10 December 1809.

The Battle of Trangen took place on 25 April 1808 at Trangen in Flisa, Hedemarkens Amt, between Swedish and Norwegian troops, as a part of the Dano-Swedish War of 1808–1809. The invading Swedish troops, led by Colonel Carl Pontus Gahn, were surrounded and forced to surrender by the Norwegian troops under the command of Bernhard Ditlef von Staffeldt. Gahn and around 450 of his troops were captured.

Flisa is the administrative centre of Åsnes Municipality in Innlandet county, Norway. The village lies at the confluence of the rivers Flisa and Glomma. The Norwegian National Road 2 and the Solørbanen railway line both pass through the village. The village of Kjellmyra is located about 3 kilometres (1.9 mi) to the south, the village of Sønsterud is about 6 kilometres (3.7 mi) to the northeast, and the village of Gjesåsen is about 6 kilometres (3.7 mi) to the north. Åsnes Church is located on the west side of the village of Flisa.

Hedmark was a county in Norway from 1 January 1919 to 31 December 2019, bordering Trøndelag to the north, Oppland to the west, Akershus to the south, and Sweden to the east. The county administration is in Hamar.