Napoleon reached the battle-field of Jena Oct. 14, 1806, and crushed the Prussian army. October 27 the conquering French battalions made a triumphal entry into Berlin. November 25,--the day so frequently occurring in the story of Burr’s conspiracy, when Jefferson received General Wilkinson’s despatch, and when Wilkinson himself reached New Orleans,--the Emperor Napoleon left Berlin for Poland and Russia. Before leaving Berlin he signed a paper destined to become famous throughout the world under the name of the Berlin Decree. This extraordinary mandate, bearing the date of Nov. 21, 1806, began by charging that England disregarded the law of nations. She made non-combatants prisoners of war; confiscated private property; blockaded unfortified harbors and mouths of rivers, and considered places as blockaded though she had not a single ship before them,--even whole coasts and empires. This monstrous abuse of the right of blockade had no other object than to raise the commerce and industry of England on the ruin of the commerce and industry of the Continent, and gave a natural right to use against her the same weapons and methods of warfare. Therefore, until England should recognize and correct these violations of law, it was decreed--(1) That the British Isles were in a state of blockade; (2) That all intercourse with them was prohibited; (3) That every Englishman found within French authority was a prisoner of war; (4) That all British property, private as well as public, was prize of war; (5) That all merchandise coming from England was prize of war; (6) That half the product of such confiscations should be employed to indemnify merchants whose property had been captured by British cruisers; (7) That no ship coming from England or her colonies should be admitted into any port; (8) That every vessel trying to elude this rule by means of false papers should be confiscated. This decree, which cut the roots of neutral rights and of American commerce with Europe, was published at Paris in the “Moniteur” of Dec. 5, 1806. At the same time news arrived that Hamburg, and nearly all the north coast of Germany along the German Ocean and the Baltic, had fallen into Napoleon’s hands, or was certain soon to become his prey. When Armstrong, watching with keen interest the rapid progress of French arms, took up the “Moniteur” which contained the Berlin Decree, he might well have started to his feet with the cry that at last he understood what the Emperor would be at. A part of the enigma which had perplexed diplomacy was explained, and what was not yet revealed might vaguely be divined.