The Dano-Swedish War of 1813–1814[5] also referred to as Charles John’s campaign against Denmark, or as the War for Norway (Danish: Kampen om Norge)[6][7] was the Coalition campaign against Denmark-Norway led by the Swedish crown prince Charles John, and it was the last major conflict between Denmark and Sweden.

The war was a part of Sweden's campaign against the French Empire, who after defeating at The Battle of the Nations turned its attention to Napoleon's last ally Denmark–Norway.

In the peace treaty Denmark was forced to give Norway to Sweden, ending the 400 year personal union between them.

[8] The war with Russia meant that Sweden did not have its strong infantry, but the Swedish crown prince did manage to replace the fallen with new and educated soldiers.

Because Charles John was already in Germany fighting Napoleon, it meant that he could counter march through Denmark-Norway’s German duchies, thereby pressuring Frederick VI of Denmark to cede Norway.

[10] The Danish army on the other hand had barely lost any troops in the Napoleonic Wars, and it was fairly strong when it was deployed to Northern Germany in 1813.

[11] Denmark was by 1812 still allied with Napoleon, and the Danish king Frederik VI had signed a secret defense agreement with France in a treaty at Fontainebleau, in which he put 10,000 soldiers at his disposal.

[12][13] The Swedish Crown Prince Charles John had left Sweden and assembled an army of 50,000 troops to invade Denmark over the Elbe through Holstein, and with that conquer the last ally of Napoleon.

[15] Before the Swedish Crown prince arrived, the Russian general Ludwig von Wallmoden-Gimborn engaged in a battle with the Danes at Boden.

[14] Deserting became a growing problem after the Battle of Bornhöved (1813) and became even greater while the Danish army was stationed at the fortified cities of Glückstadt and Rendsburg, especially from the Holsteinian regiments.

[19] The occupation of Holstein was meant to put pressure on Frederik VI of Denmark, but the king was unwilling to give up Norway.

[23] Denmark was also forced to join the Coalition and send an army of 10,000 troops to be under the command of Marshall Bernadotte, for which they would receive a subsidy of 400,000 pounds.

In return, Denmark would gain Swedish Pomerania and Rügen – which they then traded with Prussia for the Duchy of Lauenburg in the Congress of Vienna – and an indemnity of 1 million rixdollars.