As the Northern Wars progressed , Charles X Gustav of Sweden crossed the frozen straits from Jutland .
As the Northern Wars progressed , Charles X Gustav of Sweden occupied the Danish island of Zealand , with the invasion beginning on 11 February 1658 .
As the Northern Wars progressed , Charles X Gustav of Sweden crossed the frozen straits from Jutland and occupied the Danish island of Zealand , with the invasion beginning on 11 February 1658 .