What was the Peace of Tilsit and how did it weaken Prussia?

The Treaties of Tilsit were agreements signed in July 1807 between France, Russia, and Prussia following Napoleon’s decisive military victories at Jena, Auerstädt, and Friedland.1

The treaty severely weakened Prussia, reducing it to a state of helplessness through several harsh measures:

• Territorial Loss: Prussia was reduced to roughly half its former size and population. It was forced to cede all territories west of the Elbe River and nearly all lands acquired during the Partitions of Poland.23
• New Entities: Detached Polish provinces were used to create the Duchy of Warsaw, while other former Prussian lands were incorporated into the newly established Kingdom of Westphalia.13
• Financial and Military Burden: Prussia was subjected to French military occupation until a massive war indemnity of 120,000,000 francs was paid.13
• Economic Constraints: Prussia was forced to join the Continental System, closing its ports to British trade.13

These catastrophic losses necessitated the fundamental state reforms later championed by Karl, Reichsfreiherr vom und zum Stein, who sought to modernize Prussia’s administration and society in the wake of the defeat.42