York demanded that all persons "noised or indicted of treason" should be apprehended, committed to the Tower, and brought to trial. All this the king, or his advisers, promised, and as Somerset was one of the persons chiefly aimed at by York, the king gave an instant order for the arrest and committal of Somerset, and assured York that a new council should be summoned, in which he himself should be included, and all matters decided by a majority. At these frank promises York expressed himself entirely satisfied, disbanded his army, and came bareheaded to the king's tent. What occurred, however, was by no means in accordance with the honourable character of the king, and savoured more of the councils of the queen. No sooner did York present himself before Henry, and begin to enter upon the causes of complaint, than Somerset stepped from behind a curtain, denied the assertions of York, and defied him to mortal combat. So flagrant a breach of faith showed York that he had been betrayed. He turned to depart in indignant resentment, but he was informed that he was a prisoner. Somerset was urgent for his trial and execution, as the only means of securing the permanent peace of the realm. Henry had a horror of spilling blood; but in this instance York is said to have owed his safety rather to the fears of the ministers than any act of grace of the king, who was probably in no condition of mind to be capable of thinking upon the subject. There was already a report that York's son, the Earl of March, was on the way towards London with a strong army of Welshmen, to liberate his father. This so alarmed the queen and council that they agreed to set free the duke, on condition that he swore to be faithful to the king, which he did at St. Paul's, Henry and his chief nobility being present. York then retired to his castle of Wigmore.