To this command of Peter they all promised obedience. On the other hand, the barons, knights, and squires, who had remained in the marshes so near the enemy, were far from being comfortable: some of them were up to their ankles in mud, and other half way up their legs. But their eagerness and joy, on gaining this pass with so much honour, (for very gallant deeds of arms were likely to ensue) made them forget all their pains and difficulties. If it had been in summer-time, instead of the seventh day of November, they would have enjoyed I; but now the ground was cold, muddy and dirty, and the nights were long.
At times also it rained heavily on their heads, but it ran off, as they had their helmets on and everything prepared for the combat, and were only waiting for the enemy to come and attack them. The great attention they paid to be in readiness kept up their spirits, and made them almost forget their situation.
The lord de St. Py full loyally acquitted himself in this expedition, as a scout and observer of what the Flemings were doing, though he was the commander-in-chief. He was continually on the look-out, and went privily to reconnoitre their motions. On his return, he said to his companions, in a low voice, "Now up: our enemies are very quiet: perhaps they will advance on us at day-break: therefore be on your guard, and prepared to act." He would then return again, to see if any thing were going forward, and then come back to tell what he had observed. This he continued to do until the hour which the Flemings had fixed on to attack them.
It was on the point of day when they began their march in close order, without uttering a word. The lord de St. Py, who was on the watch, no sooner saw this manoeuvre than he found they were in earnest, and hastening to his companions, said to them, "Now, my lords, be alert, we have but to do our utmost, for our enemy is on his march, and will be instantly here. These barons of new date are advancing slowly, and think to catch and surprise us: show yourselves true men at arms, for we shall have a battle."
As the lord de St. Py uttered these words, the knights and squires, with great courage, seized their long Bordeaux spears, and having grasped them with a hearty will, placed themselves in as good order as any knights or squires could devise.
When the lords who had crossed the river, and, as I have before said, found themselves obliged to halt in the marshes, saw that the Flemings waited for their opportunity to attack them, they said among themselves, "Since we are not in sufficient force to begin the combat, when the Flemings advance on us they will not know what numbers we are: let us each set up one cry, or that of the lord to whom we may belong whether he be present or not; and, by thus shouting loudly, we shall so much alarm them that they may be defeated. In addition to this, we will receive them on the points of our spears."
In this manner did it fall out: for, when the Flemings advanced to the combat, the knights and squires began to utter their war cries, in so much that the constable and the van-guard, who had not yet crossed the bridge, heard them, and said, "Our friends are engaged; may God help them! for at this moment we are unable to give them any assistance."
Peter du Bois marched in front, and was followed by his Flemings; but, when they approached the French, they were received on the sharp points of their long Bordeaux spears, to which their coats of mail made not more resistance than if they had been of cloth thrice doubled, so that they passed through their bodies, heads and stomachs.
When the Flemings felt these sharp spears which impaled them, they fell back, and the French advancing gained ground upon them; for there were none so hardly but what feared their strokes. Peter du Bois was one of the first wounded and run through by a lance. It came quite out at his shoulder: he was also wounded on the head, and would have been instantly slain if it had not been for the body-guard he had formed, of thirty stout varlets, who taking him in their arms, carried him as quickly as they could out of the crowd.
The mud from the causeway to Commines was so deep that all these people sunk in it up to the middle of their legs. The men at arms, who had been long accustomed to their profession, drove down and slew the Flemings without let or hindrance: they shouted, "St. Py for ever!" "Laval, Sancerre, Anghien," and the war-cries of others who were there.
The Flemings were panic-struck, and began to give way, when they saw these knights attack them so vigourously and pierce them through with their spears. They retreated, and falling back on each other, were followed by the French, who marched through them or around them, always attacking the thickest bodies. They no more spared killing them than if they had been so many dogs; and they were in the right, for, had the Flemings conquered, they would have served them the same.
The Flemings, finding themselves thus driven back, and that the men at arms had won the causeway and bridge, counselled together, to set fire to the town, in hopes it would cause the French to retreat, or enable them to collect their people. This was executed, and fire set to several houses, which were instantly in flames; but they were disappointed in thinking by this to frighten the French, for they pursued them as valiantly as before, fighting and slaying them on the ground, or in the houses whither they had retreated.
Upon this, the Flemings made for the open plain, where they collected in a body. They sent to ... neighbouring towns, to urge them to come to their assistance at Commines. Those who fled, and the inhabitants of the villages near Commines, began to set their bells a-ringing, which clearly showed there was an engagement going forward. Some of them, however, began to slacken, and others to occupy themselves in saving what they could of their goods, and to carry them to Ypres or Courtray. Women and children ran thither, leaving their houses full of furniture, cattle and grain. Others again marched in haste towards Commines, to help their countrymen who were fighting.
While all this was passing, and those valiant knights who had crossed the Lis in boats were so gallantly engaged, the constable and van-guard were busily employed in attempting to repair the bridge and cross it. There was a very great throng, for the constable had given permission for all to pass it who could. There was much danger for those who crossed it first; and the lords who did so were obliged to step on targets thrown on the beams of the bridge. When they had crossed, they began to strengthen the bridge, for they found the planks lying on the ground, which they put in their proper places. During the night two waggon loads of hurdles were brought, which were of great use to them, so that shortly it was made as strong as ever. On the Tuesday the whole van-guard, passed, took possession of the place, and, as they crossed, fixed their quarters in the town...
Those of the vanguard who were in Commines drove out the Flemings. There were slain of them in the streets and fields about four thousand, not including those killed in the pursuit, in wind-mills, and in monasteries, whither they had fled for shelter; for, as soon as the Bretons had crossed, they mounted their horses and began a chase after the Flemings, and overran the country, which was then rich and plentiful...
The first Bretons, Normans and Burgundians who entered Flanders by the pass at Commines, paid no attention to pieces of cloth, furs or jewels, but to the gold and silver which they found. However, those who followed after cleared the whole country, for every thing was acceptable to them.