Lillebælt

The Little Belt separates Jutland from the island of Funen, forming one of the passages between the Baltic and the waters to the north. Its narrow waters usually offered Denmark a natural barrier against an army advancing from the mainland. In the exceptionally cold winter of 1658, however, Charles X Gustav of Sweden led his troops across the frozen strait from Jutland to Funen. The march continued over the Danish islands and brought the war close to Copenhagen.