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Copenhagenization refers to the practice of confiscating the warships of a defeated enemy. It first occurred when the British fleet under Admiral Gambier landed Army units equipped with phosphorus loaded Congreve rockets for the Second Battle of Copenhagen in 1807.
After the British Navy stole a part of the Dano-Norwegian Navy (merchant ships as well as Men of wars, which at the time was located in Eastern Zealand), the practice of confiscating all (or most) of the ships of a defeated enemy became more common and would be expressed by the term Copenhagenize. In 1830, the American author Richard Emmons published an Epic poem on the late war of 1812, the The Fredoniad, or Independence preserved in which he wrote of the merits and risks of independence:
Aw'd by the naval sceptre of the king—
Our fleet would Copenhagenize each town,
And with the torch burn every hamlet down.
The term would later be used by Justin Winsor in his Narrative and critical history of America (1888) where he described the outfitting of independent vessels to warfare being done somewhat covertly, in order to avoid the vessels being "Copenhagenized at once by the invincible British Navy" at the outbreak of hostilities. Also, in the 1881 Political Science, Political Economy, and the Political History of the United States, John J. Lalor, editor, wrote:
But, even when the [embargo] was repealed in 1809, the belief that Great Britain would "Copenhagenize" any American navy which might be formed was sufficient to deter the democratic leaders from anything bolder than non-intercourse laws, until the idea of invading Canada took root and blossomed into a declaration of war.
In 1940, after the Fall of France, the British destroyed the warships of neutral Vichy stationed in the ports of Oran and Dakar with the Attack on Mers-el-Kébir, fearing that the French ships would fall into German hands.