In all this the hand of Louis, king of France, was not openly seen. Undoubtedly, however, the movement had his encouragement from the beginning, and very likely his promise of open support when the time should come. The death of the male heir to England and Normandy would naturally draw Henry's daughter Matilda, and her husband the emperor, nearer to him; and of this, while Henry was still in England, some evidence has come down to us though not of the most satisfactory kind. Any evidence at the time that this alliance was likely to become more close would excite the fear of the king of France and make him ready to support any movement against the English king. Flanders would feel the danger as keenly, and in these troubles Charles the Good abandoned his English alliance and supported the cause of France. The contest which followed between the king and his revolted barons is hardly to be dignified with the name of war. The forced surrender of a few strongholds, the long siege of seven weeks, long for those days, of Waleran of Meulan's castle, of Pont Audemer and its capture, and the occupation of Amaury of Montfort's city of Evreux, filled the remainder of the year 1123, and in March of 1124 the battle of Bourgtheroulde, in which Ralph, Earl of Chester, defeated Amaury and Waleran and captured a large number of prisoners, virtually ended the conflict. Upon the leaders whom he had captured Henry inflicted his customary punishment of long imprisonment, or the worse fate of blinding. The Norman barons had taken arms, and had failed without the help from abroad which they undoubtedly expected. We do not know in full detail the steps which had been taken to bring about this result, but it was attributed to the diplomacy of Henry, that neither Fulk of Anjou nor Louis of France was able to attack him. Henry probably had little difficulty in moving his son-in-law, the emperor Henry V, to attack Louis of France. Besides the general reason which would influence him, of willingness to support Matilda's father at this time, and of standing unfriendliness with France, he was especially ready to punish the state in which successive popes had found refuge and support when driven from Italy by his successes. The policy of an attack on Louis was not popular with the German princes, and the army with which the Emperor crossed the border was not a large one. To oppose him, Louis advanced with a great and enthusiastic host. Taking in solemn ceremony from the altar of St Denis the oriflamme, the banner of the holy defender of the land, he aroused the patriotism of northern France as against a hereditary enemy. Even Henry's nephew, Theobald of Blois, led out his forces to aid the king. The news of the army advancing against them did not increase the ardour of the German forces; and hearing of an insurrection in Worms, the Emperor turned back, having accomplished nothing more than to secure a free hand for Henry of England against the Norman rebels.