The Truth about Islamic Crusades and Imperialism by James Arlandson

It is only natural that the Quran would be filled with references to jihad and qital, the latter word meaning only fighting, killing, warring, and slaughtering. Textual reality matches historical reality in the time of Muhammad. And after.

But this means that the Church had to fight back or be swallowed up by an aggressive religion over the centuries. Thus, the Church did not go out and conquer in a mindless, bloodthirsty, and irrational way—though the Christian Crusades were far from perfect.

Islam was the aggressor in its own Crusades, long before the Europeans responded with their own.