In 1500 King Hans of Denmark, Sweden and Norway made an ill-fated attempt to conquer the Ditmarshes (Dithmarschen) in Northern Germany. Knut Alvsson, who had married the granddaughter of Karl Knutsson, and was involved with the Swedish Independence Party, concluded it was time to act. Parallel to a new Dano-Swedish War, his rebellion began in 1501 in Sweden, but soon came to Båhus Fortress on the Swedish-Norwegian border, which Henrich Krummedige commanded. Krummedige held his fief at Båhus, but Alvsson captured Akershus Fortress in March 1502, although the citizens of Oslo remained pro-Danish while the nobles and bishops of the country remained neutral—presumably waiting to see which side prevailed.