Blockades And Counter-Blockades

War of 1812 Era

From the 1812, the war and its moral: a Canadian chronicle By William Foster Coffin:

In May, 1806, Mr. Fox, then leader of the British Government, had declared the coasts of France and Holland...to be in a state of blockade... .

In November, 1806, and in November, 1807, Napoleon, by Decrees dated from Berlin and Milan respectively, retaliated. He declared the whole British Islands to be in a state of blockade, authorized the seizure of any vessel of any nation bound to Britain... . Constructive blockade was an innovation in the enginery of war. It was blockading run mad.

Also see another post with this source.