The count de St Pol, who had retreated to Therouenne, sent an especial summons throughout Picardy for another assembly of men at arms, in the hopes of retrieving his honour. The lord de Dampierre, sir John de Craon, lord de Dompinart[84], sir Morlet de Querecqs, the lord de Fosseux, the lord de Chin, the lord de Houcourt, and many other nobles, came to him numerously attended. The count held many councils with them; and it was determined to march to the frontiers of the enemy’s country, and to harrass them by every possible means. As they were preparing to put their intentions into execution, the king of France sent orders to the count and the other nobles not to proceed further in this business, for that he had provided other commanders. In truth, he sent the marquis du Pont, son to the duke de Bar, the count de Dammartin[85], and Harpedanne, a knight of high renown, with four hundred men at arms and five hundred others, to quarter themselves at Boulogne, and other places on the frontiers of the Boulonois. The count de St Pol was not well pleased at this; but he was forced to suffer, whether willingly or not, the talk of the public, as there was no other remedy than to let the public talk on. John duke of Burgundy was in his county of Flanders when he heard of the great defeat of the count de St Pol before Mercq. He was much vexed thereat, and sent sir John de la Vallée, knight, in haste to Gravelines, and other places on that frontier, with men at arms and cross-bows, to prevent the English from doing any injury to them. The guard of this country was also intrusted by the king of France to sir Lyonnet d’Arummes, who, night and day, most diligently attended to it. King Henry of England, having learnt from his commander at Calais the brilliant success he had obtained over the French before Mercq, ordered an army of four or five thousand combatants to be instantly raised. He embarked this force on board the vessels prepared for it, and ordered them to cruise off Dunkirk and Neuport, and to disembark the army at Sluys. About three thousand were landed on the strand, and marched along it about the distance of a league to attack the castle of Sluys; but the garrison, in conjunction with the inhabitants of the country, who were greatly frightened, defended it very valiantly, and, what with cannons and other offensive weapons, repulsed their enemies, killing about sixty,—among whom was the earl of Pembroke, one of their leaders[86]. News was brought to the English, that the duke of Burgundy was marching a great force against them; on which they returned to their ships, and then to England. The duke of Burgundy, however, was not long before he ordered a number of men at arms to be collected under the command of the lord de Croy[87], and others his captains, to defend his country against the invasions of the English. They assembled on the frontiers of Flanders to oppose the English, should they again return to his coasts.