 In March 1664 the Swedish Diet came out in favour of waging war on the Free Imperial City of Bremen.Right after Leopold I, who was busy with wars against the Ottoman Empire, had enfeoffed the minor King Charles XI of Sweden with Bremen-Verden, while the neighbouring Brunswick and Lunenburg-Celle was occupied by succession quarrels and France not opposed, Sweden started the Second Bremian War (1665–66) from its Bremen-Verden fief.The Swedes under Carl Gustaf Wrangel laid siege to the city of Bremen.