In the Battle of Mohrungen on 25 January 1807, most of a First French Empire corps under the leadership of Marshal Jean-Baptiste Bernadotte fought a strong Russian Empire advance guard led by Major General Yevgeni Ivanovich Markov. The French pushed back the main Russian force, but a cavalry raid on the French supply train caused Bernadotte to call off his attacks. After driving off the cavalry, Bernadotte withdrew and the town was occupied by the army of General Levin August, Count von Bennigsen. The fighting took place in and around Morąg in northern Poland, which in 1807 was the East Prussian town of Mohrungen. The action was part of the War of the Fourth Coalition in the Napoleonic Wars.

Charles XIV John was King of Sweden and Norway from 1818 until his death in 1844 and the first monarch of the Bernadotte dynasty. In Norway, he is known as Charles III John and before he became royalty in Sweden, his name was Jean-Baptiste Jules Bernadotte. During the Napoleonic Wars, he participated in several battles as a Marshal of France.