Ambrose Bierce once quipped that war was God’s way of teaching Americans geography. He could have said “teaching us history,” for the enemy is emboldened by our ignorance not just of where he lives but of how he lives, his beliefs and values, and to understand these traditions we must understand their history. Unfortunately, in the current war against Islamic jihad we persist in ignoring the documented history of Islam and its beliefs, accepting instead the spin and distortions of various propagandists, apologists, and Western useful idiots. This imperative to know the enemy’s beliefs is particularly important for understanding the...