Though they professed themselves willing to maintain the Catholic religion the friends of William of Orange had strong leanings towards Protestantism. Calvinist preachers flocked in from France; Calvinist communities began to be formed; and in districts where the party found itself powerful enough to do so, attacks were made on Catholic churches and Catholic worship. These outrages served to indicate the real tendency of the movement, and to drive into the opposite camp many Catholics who had joined the party merely to secure redress of political grievances. The Duchess of Parma, having failed to put an end to the disturbances by friendly negotiations, determined to employ force against the rebels. She was completely successful. William of Orange fled to Germany, and Counts Egmont and Horn surrendered themselves to the mercy of the king (1567). Had Philip II. known how to take advantage of this victory he might have put an end to Calvinism in the Netherlands, for as yet the vast majority of the inhabitants were at heart loyal to the Catholic church. But instead of coming to make a personal appeal for the allegiance of his subjects and of trying to win over the malcontents by a policy of moderation Philip II., more concerned for the suppression of heresy than for the maintenance of Spanish rule, sent the Duke of Alva[3] (1567-72) with an army of ten thousand men to punish the offenders and to wipe out all traces of Calvinism. Alva was a soldier who had distinguished himself on many a field against the Turks and against France. His character is sufficiently indicated by the title "the iron duke" given him by those who knew him best. He had no faith in diplomacy or concession. For him martial law was the only means of reducing rebels to subjection. The Duchess of Parma, unwilling to share the responsibility of government with such an associate, petitioned for her recall, and the Duke of Alva was appointed regent of the Netherlands. Two leaders of the rebellion, Counts Egmont and Horn, were tried and put to death (1568), as were also many of their followers. The goods of the rebels were confiscated, soldiers were quartered on the districts which were supposed to be sympathetic with the movement, and martial law became the order of the day. But the cruel measures adopted by the Duke of Alva did not put an end to the rebellion in the Netherlands. On the contrary, the contempt shown by him for the constitution of the country and the rights of individual citizens, the excessive taxation, and the license given to the soldiers in their treatment of civilians served only to embitter the issue and to drive even moderate men into the path of rebellion. William of Orange, backed by his brother, Louis of Nassau, made descents upon the country, while vessels manned by their supporters set themselves to do as much harm as possible to Spanish trade. With the aid of England they managed to capture the city and port of Briel (1572).