In the early part of the seventeenth century the struggle against the monopoly of the Imperial posts developed. The States were jealous of the growing power of Austria, and political affinities were weakening. There was, moreover, some feeling against such an office being held by an alien family.[719] The Palatinate, Würtemberg, Saxony, Brandenburg, and Mecklenburg established posts within their respective territories.[720] The whole question became involved with the disputes which led up to the Thirty Years' War, and the princes found their position indirectly strengthened by the Peace of Westphalia, which contained no settlement of the disputes regarding the posts, but merely referred the question to the next Reichstag. Attempts were made to extend the Imperial posts, but much opposition was encountered. Nevertheless, the system continued to expand and attained considerable dimensions. The family held the exclusive right of carrying passengers as well as letters; and it was estimated that during the eighteenth century the house of Thurn and Taxis received a gross sum of 20,000 livres per day, and a net profit of four millions a year. Some 20,000 men, and a greater number of horses, were employed in the service.[721] The Revolutionary Wars were disastrous to the system. The Taxis posts were in many instances replaced by territorial posts,[722] and by the Peace of Luneville (1801), which made the Rhine the boundary between France and Germany, the family lost control of all their posts to the west of the Rhine. They were, however, compensated for the loss of the revenues of those posts by a grant of territory (Reichs-Deputationshauptschluss of 25 February 1803).