Amidst this concert of acclamations and prayers the Christian army advanced into the plain. To consider only the state to which it was reduced, it had rather the appearance of a vanquished army than of one which was marching to victory. A great number of the Crusaders were almost without clothes. Most of the knights and barons marched on foot. Some were mounted on asses, and some on camels; and, which is worthy of note on such a day, Godfrey Bouillon was obliged to borrow a horse of the count of Toulouse. In the ranks were sickly attenuated men, marching with difficulty, and only supported by the hope of either conquering or dying in the cause of Christ.

All the plains near Antioch were covered with Mussulman battalions. The Saracens had divided their army into fifteen bodies, arranged in échelons. In the midst of all these bodies, that of Kerbogha looked like an inaccessible mountain. The Saracen general, who had no expectation of a battle, at first supposed that the Christians were coming to implore his clemency. A black flag, hoisted on the citadel of Antioch, which was the signal agreed upon to announce the resolution of the Crusaders, soon convinced him that he had not to deal with supplicants. Two thousand men of his army, who guarded the bridge of Antioch, were cut to pieces by the count de Vermandois. The fugitives carried terror to the tent of their general, who was playing at chess at the time. Roused from his false security, Kerbogha ordered the head of a deserter, who had announced to him the speedy surrender of the Christians, to be struck off, and prepared for battle.

On leaving Antioch, the Christian army advanced westward, towards the point where the mountains approach the Orontes. Drawn up in battle-array on a vast space where the mountains formed a half-circle around them, and secured them from surprise, their line extended into the plain a league from the city. Hugh, the two Roberts, the count de Belesme, and the count of Hainault placed themselves at the head of the left wing; Godfrey was on the right wing, supported by Eustache, Baldwin du Bourg, Tancred, Renaud de Toul, and Erard de Puyset. Adhemar was in the centre, with Gaston de Béarn, the count de Die, Raimbaut of Orange, William of Montpellier, and Amenjeu d’Albret. Bohemond commanded a body of reserve, ready to fly to any point where the Christians should require help. When Kerbogha saw the dispositions of the Christians, he ordered the sultans of Nicea, Damascus, and Aleppo to make the tour of the mountain, and afterwards reascend the Orontes, so as to place themselves between the Christian army and the city of Antioch. He at the same time drew up his army, to receive the Christians and repulse their attack. He placed his troops partly on the heights, partly in the plain. His right wing was commanded by the emir of Jerusalem, and his left by one of the sons of Accien. For himself, he remained upon a lofty hill, to give his orders, and watch the movements of the two armies.

At the moment the battle began, Kerbogha was seized with fear, and he sent to the Christian princes to propose a combat between a given number on each side, to prevent the general carnage. But this offer, which he had rejected the day before, was not likely to be adopted by the leaders of an army full of ardour and confident of victory. The Christians did not doubt that Heaven would declare for them, and this persuasion must render them invincible. In their enthusiasm they looked upon the most natural events as prodigies which announced the triumph of their arms. A ball of fire, which the evening before had passed over Antioch, and burst over the Saracen camp, appeared to them a certain forerunner of victory. As they left Antioch, a slight rain refreshed the hot air of the season and the climate, and appeared in their eyes a fresh proof of the favour of Heaven. A strong wind, which added speed to their javelins and impeded those of the enemy, was for them like the wind of celestial anger, raised to disperse the infidels. Animated by these persuasions, the Christian army was impatient for the fight. They marched towards the enemy in perfect order: a profound silence prevailed, broken alone by the voices of the commanders, the hymns of the priests, and the exhortations of Adhemar.

All at once the Saracens commenced the attack; they discharged a shower of arrows, and rushed upon the Christians, uttering barbarous howlings. In spite of their impetuous charge, their right wing was quickly repulsed and broken by the Christians. Godfrey met with greater resistance in their left wing; he, however, succeeded in shaking it, and throwing their ranks into disorder. At the moment the troops of Kerbogha began to give way, the sultan of Nicea, who had made the tour of the mountain and returned along the banks of the Orontes, fell upon the rear of the Christians with such impetuosity as to threaten the destruction of the body of reserve under Bohemond. The Crusaders, who fought on foot, could not stand against the first charge of the Saracen cavalry. Hugh the Great, when warned of the danger of Bohemond, abandoned the pursuit of the fugitives and flew to the succour of the reserve. Then the fight was renewed with fresh fury. Kilidj-Arslan, who had to avenge the disgrace of several defeats, as well as the loss of his states, fought like a lion at the head of his troops. A squadron of three thousand Saracen horsemen, all bristling with steel, and armed with clubs, carried disorder and terror into the ranks of the Christians. The standard of the count de Vermandois was borne off and retaken, covered with the blood of Crusaders and infidels. Godfrey and Tancred, who flew to the aid of Hugh and Bohemond, signalized their strength and courage by the death of many Mussulmans. The sultan of Nicea, whom no reverse could subdue, still sustained the shock of the Christians. In the heat of the fight he caused lighted flax to be cast among the heath and dried grass which covered the plain. A conflagration quickly ensued, which encircled the Christians with volumes of fire and smoke. Their ranks were for a moment broken, and they paid no attention to the voices of their leaders. The sultan of Nicea was about to gather the fruit of his stratagem, and victory was on the point of escaping from the hand of the Christians.

At that moment, say the historians, a squadron was seen coming down from the mountains. It was preceded by three horsemen clothed in white, and covered with shining arms: “Behold!” shouted Bishop Adhemar, “behold the celestial succour that was promised you. Heaven declares for the Christians; the holy martyrs, George, Demetrius, and Theodore, are come to fight for us.” Immediately all eyes were turned towards the celestial legion. A new ardour took possession of the hearts of the Crusaders, who were persuaded that God himself was come to their succour; the war-cry Dieu le veut was shouted with as much vigour as at the commencement of the battle. The women and children animated the warriors by their acclamations from the battlements; and the priests continued to pray and sing aloud their hymns and sacred songs of encouragement to the host.

Every Crusader became a hero; nothing could resist their impetuous shock. In a moment the Saracens were shaken everywhere, and only fought in wild disorder. They made an effort to rally on the other side of a torrent, and again on an elevated spot, whence their clarions and trumpets resounded; but the count de Vermandois attacked them in this last intrenchment, and quickly put them to the rout. There was shortly no safety for them but in flight. The banks of the Orontes, the woods, the plains, the mountains, were covered with fugitives, who abandoned their arms and their baggage.

Kerbogha, who had prematurely announced the defeat of the Christians to the caliph of Bagdad and the sultan of Persia, fled with all speed towards the Euphrates, escorted by a small number of his most faithful soldiers. Several emirs had fled before the end of the battle. Tancred and some others, mounted upon the horses of the conquered, pursued till nightfall the sultans of Aleppo and Damascus, the emir of Jerusalem, and the dispersed wreck of the Saracen army. The conquerors set fire to the intrenchments, behind which the enemy’s infantry had taken refuge. A great number of Mussulmans perished there in the flames.

According to many contemporary historians, the infidels left a hundred thousand dead on the field of battle. Four thousand Crusaders lost their lives on this glorious day, and were placed in the list of martyrs.

The Christians found abundance in the tents of their enemies; fifteen thousand camels and a vast number of horses fell into their hands. In the camp of the Saracens, where they passed the night, they admired at leisure the luxury of the Orientals, and examined with surprise the tent of the king of Mossoul, in all parts of which glittered gold and precious stones, and which, divided into long streets, flanked by high towers, resembled a fortified city. They employed several days in carrying into Antioch the spoils of the conquered. The booty was immense, and every soldier found himself richer than when he left Europe.