The Christians spent July 15, a Sunday, recuperating and preparing, including spiritually. On their knees, tearful men beat their chests and implored God for strength. Militant clergymen — all of whom were determined “to rip from the hands of the Muslims the land they held to the injury of the Christian name” — roamed the camp, administered the Eucharist, heard the confessions of and exhorted the crusaders to fight with all their might.

Then, as one participant wrote, about midnight, “the voice of exultation and confession sounded in the Christian tents and the voice of the herald summoned all to arm themselves for the Lord’s battle.”

Looking on the enemy hordes arrayed against them, Alfonso VIII of Castile, the supreme leader of the Christian coalition, grew dismal: “Archbishop,” he said to Rodrigo of Toledo, who stood alongside him, “here we will die,” though a “death in such circumstances is not unworthy.”

“If it please God,” Rodrigo responded, “let it not be death, but the crown of victory; but if it should please God otherwise, we are all prepared to die together with you.”

At the crack of dawn on July 16, battle commenced. For long it was a stalemate: “Those lined up in the first ranks discovered that the Moors were ready for battle,” writes an eyewitness:

They attacked, fighting against one another, hand-to-hand, with lances, swords, and battle-axes; there was no room for archers. The Christians pressed on; the Moors repelled them; the crashing and tumult of arms was heard. The battle was joined, but neither side was overcome, although at times they pushed back the enemy, and at other times they were driven back by the enemy.

Determined to penetrate the Muslim host, the Christians, King Alfonso later wrote,

cut down many lines of the enemy who were stationed on the lower eminences. When our men reached the last of their lines, consisting of a huge number of soldiers, among whom was the king of Carthage [Muhammad], there began desperate fighting among the cavalrymen, infantrymen, and archers, our people being in terrible danger and scarcely able to resist any longer.

For every Muslim line the Christians broke through, others instantly formed — so great were the ranks of Islam. “At one point certain wretched Christians who were retreating and fleeing cried out that the Christians were overcome.” When King Alfonso “heard that cry of doom,” he and his knights

hastened quickly up the hill where the force of the battle was. Then we, realizing that the fighting was becoming impossible for them, started a cavalry charge, the cross of the Lord going before [us] and our banner with its image of the holy Virgin and her Son imposed upon our device.

They fought valiantly, but the Africans continued to close in on them.

Then something of a miracle happened: “Since we had already resolved to die for the faith of Christ, as soon as we witnessed . . . the Saracens” attacking the cross and icons “with stones and arrows,” the furious crusaders “broke their line with their vast numbers of men, even though the Saracens resisted bravely in the battle, and stood solidly around their lord.”

Christians in the rear saw the cross appear as if miraculously and remain aloft behind enemy lines. Inspired beyond hope, the native sons of Spain broke through the Muslim center, slaughtering “a great multitude of them with the sword of the cross.” Sancho VII, who at nearly seven feet tall was known as “the giant king of Navarre,” followed by his men, was the first to bulldoze through and rout the African slave soldiers chained around the caliph’s tent (as captured in the above painting).

Instantly mounting a horse, Muhammad “turned tail and fled. His men were killed and slaughtered in droves, and the site of the camp and the tents of the Moors became the tombs of the fallen. … In this way the battle of the Lord was triumphantly won, by God alone and through God alone,” concluded the victorious king, Alfonso VIII of Castile.

Las Navas de Tolosa was seen as a miracle by pope and peasant alike. Not only was the full might of the previously unbeatable Almohad caliphate decimated, but where tens of thousands of Muslims died, only some two thousand Christians — mostly the warrior-monks of the military orders who were always wherever fighting was fiercest — perished.

More importantly, the victory ushered in Spain’s liberation from Islam, as Muslim kingdoms in the southern regions fell one by one to the sword of the Reconquista, so that, by 1248, only the remote kingdom of Granada, at Spain’s southernmost tip, remained Islamic — and it was a tributary of Castile.

Indeed, for centuries thereafter, July 16 was celebrated as the “Triumph of the Holy Cross” in the Spanish calendar, until the Second Vatican abolished it (in keeping with the spirit of the new age of intentional forgetfulness).

But not all Spaniards are forgetting. In a recent report on how Spain’s “far-right” is calling for a stop to Muslim migration (both legal and illegal), a writer referred to the Battle of Las Navas de Tolosa “to justify reclaiming Spanish lands from Muslims and expelling them.”

Raymond Ibrahim is the Distinguished Senior Shillman Fellow at the Gatestone Institute and the Judith Rosen Friedman Fellow at the Middle East Forum. The historic portion of this article was excerpted from Sword and Scimitar: Fourteen Centuries of War between Islam and the West.