Finally, the outburst came on June 12. The Slavonic Congress at Prague, already preparing to break up, met on that day to celebrate a last solemn mass. Once more they all gathered in front of the statue of S. Wenzel; but now the numbers were so great that they spread down the whole length of the Wenzels Platz. In spite of the peaceable intentions of the majority, a number of the workmen had come bearing arms. The mass went off quietly enough; but several of those who had attended it, had had their national feelings excited to the utmost; and, as they left the Wenzels Platz, they marched back singing Bohemian songs, and howling against Windischgrätz. As they passed under the Pulverthurm into the narrow and busy Zeltnergasse, which leads to the Grosser Ring, some soldiers, as ill luck would have it, came out of the neighbouring barrack. The house of Windischgrätz was in the street, and the crowd were hooting against him. Under these circumstances a collision was unavoidable. The crowd were dispersed by the soldiers; some of the students attempted to rally them, and were arrested; the workmen then tried to rescue the students; the soldiers charged, and drove them back under the Pulverthurm, and round into the wider street of Am Graben, and right up to the National Museum, which was the head-quarters of the Swornost. After a fierce struggle the soldiers stormed the Museum, and captured many of the students; but the panic had now spread to other parts of the town. Sladkowsky, at the head of the workmen, broke into the depôt of the Town Watch, and seized arms; while others rushed into the country districts round Prague, and spread the rumour that the soldiers were trying to take away all that the Emperor had granted, and to restore the feudal dues.