Westphalia to be Catholic. Osnabrück was divided almost equally between Catholicism and Protestantism. Parts of Westphalia came under Brandenburg-Prussian control during the 17th and 18th centuries, but most of it remained divided by duchies and other areas of feudal power. The Peace of Westphalia of 1648, signed in Münster and Osnabrück, ended the Thirty Years' War. The concept of nation-state sovereignty resulting from the treaty became known as "Westphalian sovereignty". After the defeat of the Prussian Army by the French at the Battle of Jena–Auerstedt, the Treaty of Tilsit in 1807 made the easternmost portion of today's Westphalia part of the
Treaty of Compiègne (1624) Treaty of Compiègne (1624) The Treaty of Compiègne of 10 June 1624 was a peace treaty between France and the Netherlands. It allowed France to subsidize the Dutch war effort against Spain in the Dutch War of Independence (1568–1648) after the end of the Twelve Years' Truce. France offered an immediate loan of 480,000 thalers, to be followed by more instalments over a period of three years in which the Dutch would continue the fight against Spain. This move was part of the general effort of France to undermine the Habsburg Empire. It led to the revival of a Franco-Dutch