Encouraged by his escape, Raymond now took the offensive, but with little result. The siege of Castelnaudary was a failure, and a good deal of desultory fighting occurred, mostly to the advantage of de Montfort, whose military skill was exhibited to the best advantage in his difficult position. The crusade was still industriously preached throughout Christendom, and his forces were irregularly renewed with fresh swarms of "pilgrims" for forty-days' service, so that he would frequently find himself at the head of a considerable army, which again would soon melt away to a handful. To utilize this varying stream of strangers of all nationalities in a difficult country which was bitterly hostile required capacity of a high order, and de Montfort proved himself thoroughly equal to it. His opponents, though frequently greatly superior in numbers, never ventured on a pitched battle, and the war was one of sieges and devastations, conducted on both sides with savage ferocity. Prisoners were frequently hanged, or less mercifully blinded or mutilated, and mutual hate grew stronger and fiercer as de Montfort gradually extended his boundaries and Raymond's territories grew less and less. The defection of his natural brother Baldwin, whom he had always treated with suspicion, and who had been won over by de Montfort when captured at Montferrand, before the siege of Toulouse, had been a severe blow to the national cause; how deeply felt was seen when, in 1214, he was treacherously given up and Raymond hanged him, with difficulty granting his last prayer for the consolations of religion.[141]