In the battle the local farmers resisted the Danes as they retreated to the walls of the town where the townsfolk didn’t let them in. They were slaughtered and then the townsfolk surrendered. The mass graves of the farmers have been a major archeological excavation.
https://en.wikipedia.org/wiki/Valdemar_Atterdag_holding_Visb... ("Valdemar Atterdag holding Visby to ransom, 1361")