Treaty of Kalisch

The Treaty of Kalisch, signed on February 28, 1813, was an alliance between Russia and Prussia against Napoleonic France. This treaty was a pivotal moment in the Napoleonic Wars, marking Prussia's shift from a reluctant ally of France to a key member of the coalition against Napoleon.1

Under the terms of the treaty, Prussia committed to restoring its pre-Tilsit territories, though it had to relinquish gains from the partitions of Poland. This alliance was crucial for Russia, as its field army was significantly smaller than Prussia's combined forces. The treaty led to Prussia declaring war on Napoleon on March 16, 1813, and a joint proclamation with Russia dissolving the Confederation of the Rhine. The Treaties of Tilsit in 1807 had previously weakened Prussia and Russia, dividing Europe between France and Russia.12