To Metternich they were wholly unwelcome. In spite of the ring-fence of censors, and custom-house officers, there was danger of the Liberal infection spreading to Austria, with disintegrating results; and the pose of the tsar as protector of German liberties was a perpetual menace. The zeal and inexperience of German Liberals played into his hands. The patriotism and Pan-Germanism of the gymnastic societies (_Turnvereine_) and students' associations (_Burschenschaften_) expressed themselves with more noise than discretion; in the South-German parliaments the platitudes and catchwords of the Revolution were echoed. Soon, in Baden, in Württemberg, in Bavaria, the sovereigns and the chambers were at odds, united only in a common opposition to the central authority. To sovereigns whose nerves had been shattered by the vicissitudes of the revolutionary epoch these symptoms were in the highest degree alarming; and Metternich was at pains to exaggerate their significance. The "Wartburg festival" of October 1818, which issued in nothing worse than the solemn burning, in imitation of Dr Martin Luther, of Kamptz's police law, a corporal's cane and an uhlan's stays, was magnified into a rebellion; drew down upon the grand duke of Weimar a collective protest of the powers; and set in motion the whole machinery of reaction. The murder of the dramatist Kotzebue, as an agent of this reaction, in the following year, by a fanatical student named Karl Sand, clinched the matter; it became obvious to the governments that a policy of rigorous repression was necessary if a fresh revolution were to be avoided. In October, after a preliminary meeting between Metternich and Hardenberg, in the course of which the latter signed a convention pledging Prussia to Austria's system, a meeting of German ministers was held at Carlsbad, the discussion of which issued in the famous Carlsbad Decrees (October 17, 1819). These contained elaborate provisions for supervising the universities and muzzling the press, laying down that no constitution "inconsistent with the monarchical principle" should be granted, and setting up a central commission at Mainz to inquire into the machinations of the great revolutionary secret society which existed only in the imagination of the authorities. The Carlsbad Decrees, hurried through the diet under Austrian pressure, excited considerable opposition among the lesser sovereigns, who resented the claim of the diet to interfere in the internal concerns of their states, and whose protests at Frankfort had been expunged from the records. The king of Württemberg, ever the champion of German "particularism," gave expression to his feelings by issuing a new constitution to his kingdom, and appealed to his relative, the emperor Alexander, who had not yet been won over by Metternich to the policy of war _à outrance_ against reform, and took this occasion to issue a fresh manifesto of his Liberal creed.