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.

The spylets arced silently downward, across a frozen strait.

After marching his army to the west and making a dangerous crossing of frozen straits in the winter of 1657/58, he surprised the unprepared Frederick III on the Danish isles and forced him into surrender.

In the war of the Gods the mountains of Melko were broken and distorted in the West, and of their fragments were made Eredwethion and Eredlomin; but the Iron Mountains bent back northward and there was a hundred leagues between them and the frozen straits at Helkarakse.

Being only about twelve miles distant from Gibraltar, the little garrison at Ceuta had felt itself by no means isolated in its position; but by frequent excursions across the frozen strait, and by the constant use of the telegraph, had kept up their communication with their fellow-countrymen on the other island.

So far they had seen no signs of the legendary dangers that had for so long prevented anyone from the Russian side crossing the frozen strait.

On 2 May he crossed the frozen strait via Douglas Island to Cape Lady Franklin, the southernmost point on Victoria Island.

During the Northern Wars, the Swedish army under Charles X Gustav of Sweden, after invading the Danish mainland of Jutland, swiftly crossed the frozen straits and occupied most of the Danish island of Zealand, with the invasion beginning on February 11, 1658.

The farthest point on this trip, the perpetually frozen strait between Foxe Basin and the Gulf of Boothia, was named after the two ships: Fury and Hecla Strait.