Today in history, on October 21, 1094, a small force of Christian knights destroyed a massive Muslim horde in Spain, where the Jihad and Reconquista had been raging. Some years earlier, the Almoravids, a North African group committed to jihadist teaching and led by the emir Yusuf bin Tashfin, began to pour into Spain to aid their Islamic counterparts, the Moors, who had suffered several significant defeats to the Christians in recent years. In 1086, the Muslims and Christians clashed at Sagrajas. The Christians were annihilated; their king barely managed to escape with a dagger stuck in his thigh. Afterwards,...