The campaign of 1778 cost the combatants some 20,000 men and 29,000,000 thalers in money. Frederick had shown himself captious and irresolute. His brother declared that he was more on his guard against the treachery of the King than against the enterprises of the enemy. The army had become dejected, ill-disciplined, and disaffected. Frederick, though he prepared to invade Moravia in the spring, spent the winter in working his hardest for peace. France and Russia lent their aid. In March, 1779, a congress of the four Powers met at Teschen, and on May 13th peace was signed. The Peace of Teschen was in some degree a triumph for Frederick. The chief points for which he had taken up arms were secured at no great cost. The Austrian acquisitions were limited to the Quarter of the Inn, a strip of territory bounded on the west by that river, while Bavaria was obliged to pay 4,000,000 thalers in settlement of the Saxon claims. Prussia seemed thus to have maintained the rights of two great German princes from motives of pure patriotism. Her military prestige, on the other hand, had suffered. She had not derived prompt support from her intimacy with Russia and she had failed to disturb the connexion between Austria and France. No less than four royal marriages now linked the Bourbons to their secular foes the Hapsburgs. By accepting the guarantee of France and Russia to a treaty in which the Peace of Westphalia was once more confirmed, Prussia had moreover paved the way for unwelcome foreign intrusions into German affairs. Frederick saw good reason to fear that the danger from Austria would be renewed so soon as Joseph should be emancipated from the restraining influence of the aged Queen. For the time being, however, he was free to resume his round of toil, to mourn the loss of Voltaire, to correspond with the philosopher d’Alembert, and to pursue reforms in law and education. The Prussian judges were now empowered to interrogate the parties to suits and compelled to hear what they had to say. A codification of the law and a Book of Rights which should stereotype the existing feudal system of society in Prussia were set on foot. And at the moment when Romanist sovereigns drove out the Jesuits, Frederick welcomed the fugitives as harmless individuals, who could help to supply one of the most pressing needs of the State by instructing the common people.