On this day, 218 years ago, July 7, 1807 (June 3, 1807 in the lunar calendar), representatives of France and Russia signed the Peace of Tilsit. On July 7, 1807, representatives of France and Russia signed the Peace of Tilsit. According to the Treaty of France and Russia, most of the area west of the Elbe River, which was originally part of Prussia, was included in the newly established Kingdom of Westphalia, with Jerome Bonaparte, brother of Napoleon I, as king; in the areas seized during the second and third divisions of Poland by Prussia (see the three divisions of Poland), the Duchy of Warsaw was established, with the King of Saxony concurrently serving as monarch; Gdansk became a free city; The Bialystok region was transferred to Russia. Russia recognized Joseph Bonaparte, brother of Napoleon I, as King of Naples and Louis Bonaparte as King of the Netherlands. It promised to transfer the Gulf of Cataro to France and recognize France's sovereignty over the Ionian Islands. The Treaty of the France-Russia Alliance signed at the same time stipulates that if Britain rejects Russia's terms of peace, Russia will sever diplomatic relations with Britain and participate in the continental blockade against Britain; if Turkey refuses to mediate or if the Russia-Turkey negotiations cannot achieve satisfactory results within three months, France and Russia will take concerted action against Turkey. The Treaty of Tilsit marked the failure of the Fourth Anti-French Alliance, and Prussia's strength suffered a serious blow. Comments: During Napoleon's strong national strength, Europe was not his opponent-dividing enemies with interests is the most common method to disintegrate enemy alliances.