From the 700s to the 1200s, Baghdad was an Intellectual Center unrivaled in the world. It's House of Wisdom studied mathematics, astronomy, medicine, alchemy and chemistry, zoology, and geography.
Simo Häyhä was a Finnish sniper in WWII who, with over 700 kills in 105 days, can be thought of as the most deadly human in history. The Russians refered to him as The White Death.
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The US knew this and had deviced a counter: Nuking all Danish straits until it was impossible to sail through them.
In case of WW3, Denmark would not only have ceased to exists as a country and a people, it would have ceased to exist as a geographical features.