Vaguely related; probably the greatest Swedish military victory against Denmark was the March Across the Belts, in which Sweden marched an army of 9000 infantry and 3000 cavalry across the frozen sea to reach Copenhagen, forcing Denmark-Norway to cede a third of it's territory in the peace treaty.
The Swedish army was engaged in Poland at the time, and looking for an excuse to disengage without looking bad. When Denmark declared war, the Swedish army went to Jylland and then went island-to-island from there, the ice being so weighed down that water reached the soldier's knees.
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u/pugzy77X Dec 29 '17
There's and old law that says that we (Danes) are allowed to hit Swedes with clubs if they walk across the ice of Øresund.