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Photo: Erik Rytter
The gun from the German u-boat U-20 which sank the liner 'Lusitania' and thus
caused the USA to enter WW1. The u-boat later was stranded at Vrist a little north
of Thorsminde, where it was blown up by its crew.

After this the Danish navy removed the gun and made it unserviceable by cutting holes
in vital parts. The gun was kept in the naval stores at Holmen in Copenhagen for
almost 80 years.

More about 'Lusitania'   here and here.   And more about U-20   here and here