Britain issued an Order in Council declaring a blockade along the European coast from Brest to the Elbe. Napoleon later pointed to this as a key justification for retaliatory economic warfare against British trade. This escalation helped set the stage for the Continental System.
Napoleon issued the Berlin Decree, declaring the British Isles “in a state of blockade” and banning trade and correspondence with Britain across French-controlled Europe. This decree created the core rules of the Continental System: allies, neutrals, and occupied territories were expected to exclude British goods. In practice, it turned trade policy into a tool of war.
After major French victories, Napoleon made separate peace agreements with Russia and Prussia at Tilsit. In secret provisions, Russia agreed to join the Continental System if Britain rejected mediation, and Prussia was also compelled to close its ports to British trade. This greatly expanded the embargo’s geographic reach.
Britain responded by expanding its own trade controls through major Orders in Council, aimed at restricting commerce with France and its allies. These measures pressured neutral shipping and pushed more countries into choosing between British and French rules. The cycle of embargo and counter-embargo made neutral trade increasingly risky.
Portugal, a long-standing British trading partner, resisted fully closing its ports to Britain. Napoleon sent forces through Spain to occupy Portugal, with French troops entering Lisbon by late November 1807. Enforcing the embargo by military occupation helped trigger the wider Peninsular War and tied down French troops.
Napoleon issued the Milan Decree to strengthen enforcement of the embargo. It treated neutral ships as lawful prizes if they had submitted to British search or complied with British trade rules. This broadened the economic war at sea and deepened conflict with neutral trading states.
As France expanded control to enforce the embargo, Napoleon forced the Spanish monarchy into abdication and installed his brother Joseph as king. Popular resistance in Spain began in 1808, turning enforcement of the Continental System into a prolonged war in Iberia. The conflict created a major drain on French manpower and resources.
To raise revenue and manage shortages, Napoleon began issuing trade licenses that allowed tightly controlled imports and exports despite the embargo. The system reflected a practical problem: total blockade hurt continental consumers and merchants, not just Britain. It also created opportunities for corruption and “legalized” parts of what had become widespread smuggling.
Napoleon ended the Kingdom of Holland and annexed it directly into the French Empire. One major goal was stricter control of customs and ports that were important for North Sea trade and smuggling routes. The move showed how the Continental System pushed Napoleon toward more direct rule over strategic trading regions.
Napoleon tightened the embargo with new penalties for smuggling British manufactured goods and for unlicensed colonial imports. The decree also required confiscation, and it ordered the public destruction of certain seized goods. These harsh measures signaled that enforcement had become a major internal security and fiscal issue, not just a foreign-policy tool.
By late 1810, Russia’s economy was suffering under restrictions on overseas trade, and political tensions with Napoleon were growing. Tsar Alexander I moved to reopen Russian ports to neutral shipping, effectively undermining the Continental System. This break was a major turning point that helped set France and Russia on a path toward war.
Napoleon absorbed key trading hubs—Hamburg, Bremen, and Lübeck—into the French Empire to strengthen customs control and restrict illicit trade. These port cities had long commercial ties across the North Sea and Baltic, making them difficult to police under a blockade. Annexation aimed to close loopholes but also increased resentment and administrative burdens.
Napoleon launched a large invasion of Russia after the embargo alliance collapsed and tensions rose over trade and security. The campaign was a disaster for the Grande Armée, weakening France’s ability to enforce economic controls across Europe. The failure showed that the Continental System could not be sustained without stable alliances and overwhelming military power.
After repeated defeats, Napoleon abdicated in April 1814, and the coalition powers negotiated a new European settlement. The 1814 Treaty of Paris formally ended the war between France and the major allied powers and marked the collapse of Napoleon’s blockade strategy as a continental policy. With Napoleon removed from power, the Continental System as an organized embargo effectively came to an end.
Napoleon's Continental System, Economic Warfare and Blockade Policy (1806–1814)