That chief was no half-hearted believer, and openly confronted the malice of the pagan party. On one occasion, as they were boasting of the power of their gods, and of the many blessings they had received by remaining faithful to their worship, he bade them put the matter to an open and decisive proof. "If there be so much doubt," said he, "concerning the superior might of our respective gods, let us see whose power is greatest: whether that of the many whom ye call gods, or that of my one omnipotent Lord, Jesus Christ. Lo! the season of rain is at hand. Do ye call upon the names of your gods, that the rain may be restrained from falling upon you, and I will call upon the name of my Lord, Jesus Christ, that no drop may fall on me; and the god that answereth our prayers, let him be God." The heathen party agreed, and repairing to a neighbouring field, took their seats in great numbers on one side, while Herigar, attended only by a little child, sat on the other. In a few moments the rain descended in torrents, drenched the heathens to the skin, and swept away their tents; while on Herigar and the little child no drop fell, and even the ground around them remained dry. "Ye see," he cried, "which is the true God; bid me not, then, desert the faith I have adopted, but rather lay aside your errors, and come to a knowledge of the truth." On another occasion the town of Birka was attacked by a piratical expedition of Danes and Swedes, under the command of a king of Sweden, who had been expelled from his realm. The place was closely invested, and there seemed to be no prospect of a successful defence. In their alarm, the townspeople offered numerous sacrifices to their gods, and when all other means failed, collected such treasures as they possessed, together with a hundred pounds of silver, and succeeded in coming to terms with the hostile chiefs. But their followers, not satisfied with the amount, prepared to storm the town. Again the gods were consulted, the altars raised, the victims offered, but with results equally unpromising. Herigar now interposed, rebuked the people for their obstinate adherence to the worship of gods that could not give aid in trouble, and when they bade him suggest some device, and promised to follow his council, he urged them to make a solemn vow of obedience to the Lord of the Christians, assuring them that, if they turned to Him, He at any rate, would not fail them in the hour of danger. The people took his advice, went forth to an open plain, and there solemnly vowed to keep a fast in honour of the God of the Christians, if He would rescue them from their enemies.