Sweden's 1658 Dano-Swedish War: The March Across the Belts

In January 1658, King Charles X Gustav of Sweden pulled off one of the most audacious military maneuvers in early modern history: marching his army across the frozen Danish straits from Jutland to Zealand, bypassing the heavily fortified Sound and forcing Denmark-Norway to surrender. This episode explores the logistics, weather, and sheer luck that made the 'March Across the Belts' possible, as well as its consequences — the Treaty of Roskilde, Sweden's largest territorial expansion, and the seeds of future conflict. We also discuss the engineering behind the crossing, the role of ice thickness reports from local fishermen, and the psychological impact on Danish defenders. A story of desperation, risk, and a winter that changed the map of Scandinavia.

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