The revolt turned out a formidable one. The first force sent against it was cut to pieces at Edgecote near Banbury, and its leaders, Earl Rivers and one of the queen's brothers, taken and beheaded. Edward was hurrying to the support of this advanced body when it was defeated; but on the news his force melted away and he was driven to fall back upon London. Galled as he had been by his brother's marriage, the king saw nothing in it save the greed of Clarence for the Earl's heritage, and it was with little distrust that he summoned Warwick with the trained troops who formed the garrison of Calais to his aid. The Duke and Earl at once crossed the Channel. Gathering troops as they moved, they joined Edward near Oxford, and the end of their plot was at last revealed. No sooner had the armies united than Edward found himself virtually a prisoner in Warwick's hands. But the bold scheme broke down. The Yorkist nobles demanded the king's liberation. London called for it. The Duke of Burgundy "practised secretly," says Commines, "that King Edward might escape," and threatened to break off all trade with Flanders if he were not freed. Warwick could look for support only to the Lancastrians, but the Lancastrians demanded Henry's restoration as the price of their aid. Such a demand was fatal to the plan for placing Clarence on the throne, and Warwick was thrown back on a formal reconciliation with the king. Edward was freed, and Duke and Earl withdrew to their estates for the winter. But the impulse which Warwick had given to his adherents brought about a new rising in the spring of 1470. A force gathered in Lincolnshire under Sir Robert Welles with the avowed purpose of setting Clarence on the throne; and Warwick and the Duke, though summoned to Edward's camp on pain of being held for traitors, remained sullenly aloof. The king however was now ready for the strife. A rapid march to the north ended in the rout of the insurgents, and Edward turned on the instigators of the rising. But Clarence and the Earl could gather no force to meet him. Yorkist and Lancastrian alike held aloof, and they were driven to flight. Calais, though held by Warwick's deputy, repulsed them from its walls, and the Earl's fleet was forced to take refuge in the harbours of France. [Sidenote: Warwick in France]