Henry, hearing of this arrangement, took counsel with his general, Hugues de Lusignan, and removed his head-quarters immediately to the neighbourhood of De Rancon's fortress, placing his troops in the meadows immediately opposite those occupied by the soldiers of Louis; the river only separated them, and across it was a long bridge, part of the ruins of which, evidently of Roman construction, may still be seen far away in the flat meadows. Henry's force was much inferior to that of his opponent, and he declined coming at once to battle, as Louis desired: he drew off his soldiers, leaving a strong defence on the bridge; by this movement wishing to indicate that he did not intend engaging; but the French could not be restrained, and Louis, giving way to their impetuosity, charged the defenders of the bridge at the head of five hundred knights. Immediately the river was covered with soldiers, who leaped into boats, and, hastening across the river, fell upon the English with great fury. The shock was well sustained; Duke Richard, brother to Henry, Lusignan, De Montford, and others, brought up their troops to the conflict. St. Louis ran great risks that day; for Joinville says, that for every man with him the English had a hundred: as he was in the thick of the fray, his life was in great peril; but he was successful, and remained in possession of the bridge, and the left bank of the Charente. Had he pursued his advantage, the English might have been entirely routed; but, reflecting that the next day was Sunday, and should be devoted to prayer, he consented to the truce proposed by Duke Richard, and ordered his men to re-cross the bridge.

Richard cunningly took advantage of this circumstance, and hurrying back to his brother's tent, exclaimed, "Quick, quick! not a moment is to be lost; let us fly or we are defeated!" As rapidly as possible the tents were struck, the baggage prepared, and every man in readiness; and, in the darkness of night, King Henry mounted his good steed, and never slackened rein till he reached the walls of Saintes, followed by his soldiers, who, harassed and fatigued, were not sorry to find themselves once more in security.

The astonishment of Louis was great, when, at break of day, he looked from his castle windows, and saw no vestige of the great army which had covered the country on the preceding night: he very quietly ordered his troops to cross the bridge, and they took possession of the spot just left by the English. The next day he prepared to march on Saintes, and sent couriers forward to reconnoitre the country: a shepherd, who had observed these movements, hastened to warn the Count de la Marche, who, with his two sons, and his vassals, were in the Faubourg de St. Eutrope. Hugues de Lusignan marched forth immediately to meet the French avant-garde, without naming his intention to the King of England who was lodged in the town.

Count Alfonse de Boulogne coming up at the moment with his party, joined the avant-garde, and a furious combat took place: the first who fell was the châtelain of Saintes, who held the banner of the Count de la Marche. On both sides resounded the terrible war-cries of "Aux armes! Aux armes!" and "Royaux! Royaux!" and "Mont-joie! Mont-joie!" according to the usage of both nations.

These cries, the neighing of horses, and the clash of arms, were heard to a great distance, and reached the ears of the King of England, who demanded the cause: he was told that the Count de la Marche, resolved to repair his honour, which he considered that their late retreat had sullied, had attacked the French. At this news Henry called for his armour, assembled his warriors, and hastened to the succour of his father-in-law. At this juncture arrived King Louis. Mortified to be forestalled by an enemy, who he considered had basely quitted the field, he gave the signal, and the soldiers of France fell pell-mell on the Anglo-Aquitainians, who received them firmly.

A general mêlée then took place beneath the walls of Saintes; and in the midst of the vines, amongst the groves, in the fields, on the high roads, a frightful carnage ensued.

The French fought with fury, increased by the resistance they met with; the English ranks began to thin; overpowered by numbers, their battalions became broken, the men turned their backs, and fled in disorder to the gates of the town, to which the French pursued them with fearful slaughter. In vain Henry and Hugues de Lusignan endeavoured to rally the dispersed troops; their expostulations were drowned in the noise and confusion, and they were themselves carried away by the stream of fugitives. Many of the French, in the ardour of the combat, entered the town with the enemy, and were made prisoners. Louis then sounded a retreat, and fixed his camp a short distance from the walls.

The following days were employed in secret negotiations between the Count de la Marche and St. Louis, which ended in their reconciliation, and the Count's abandonment of the English monarch. Meantime Henry, with his usual carelessness, after the first trouble was over, blindly deceived himself into security, and resolved to spend the heats of the month of August in quiet and enjoyment, forgetting that he was little better than a prisoner in Saintes, and taking no heed of the treachery of his friends without. Four days he allowed to pass as if no enemy were at his gates; he even made parties of pleasure, and seemed resolved to think no more of the war, when he was suddenly roused from his false security by his brother, Richard, who had been warned of the dangers which threatened them by a French knight, whose life he had saved in Palestine.

By this means the self-deceiving monarch learnt that preparations were being made by Louis to invest the town with all his forces, and that the next day at day-break the siege was to commence. When this intelligence reached Henry he was just about to sit down to table; at the same time he learnt that the citizens of Saintes proposed to treat with his foes; and he had not an instant to lose. He promptly gave orders that the houses of the bourgeois should be set on fire, and, mounting his horse, set out, hungry and fatigued as he was after a day's excursion of amusement, towards Blaye, as fast as speed could take him. His captains were soon informed of his flight; they left their half-cooked viands, as did all the army, who were still fasting, and the confusion of departure exceeded belief; all hurried towards Blaye, where they sought refuge, exhausted and worn, and but for a few berries which they gathered to satisfy the cravings of their hunger, they had nearly all perished on the way.

The following day the citizens and clergy of Saintes, in solemn procession, repaired to the camp of St. Louis, bringing with them the keys of the town, and swearing oaths of fealty. The King of France entered in triumph, occupied all the evacuated posts, and placed a garrison in the old citadel of the capital. His next care was to subdue all the lords of the neighbouring castles, which, having done, he commenced building a new line of walls to replace the dilapidated Anglo-Roman line, which was falling in ruins. After this, says the chronicler, St. Louis returned to his dominion of France, leaving garrisons in all the strong places of Saintonge and Aunis.