War of the Reunions well as the Treaty of Westphalia of 1648 (which ended the Thirty Years War), ceded a number of towns to France. By tradition, when a town changed hands, so did the surrounding rural areas, which provided it with food and other such supplies. Often, the borders of these dependent regions were ill-defined. Thus, Louis and his court, from 1670, introduced several Chambers of Reunion to investigate whether France had been granted all the territory that it had been owed. The Chambers of Reunion, loyal to the king, ruled, after a review of conflicting medieval documents, that a number of outlying
War of the Fifth Coalition not been able to save Prussia. The Russian and French armies met in February 1807 at the savage and indecisive Battle of Eylau, which left behind between 30,000–50,000 casualties. Napoleon regrouped his forces after the battle and continued to pursue the Russians in upcoming months. The action in Poland finally culminated on 14 June 1807, when the French mauled their Russian opponents at the Battle of Friedland. The resulting Treaty of Tilsit in July ended two years of bloodshed and left France as the dominant power on the European continent. It also severely weakened Prussia and formed a Franco-Russian axis