Feel free to elaborate...
Talking about atrocities without historical perspective is not historical.
There were some atrocities committed by Christians on Jews in the Crusades, that is obvious. But most were committed in 1) unsanctioned “peasant crusades” or 2) in the perspective of warfare of the time period.
During the First Crusade in Jerusalem for instance, Jewish men fought side by side with Muslims against Christians. During this time period, when the walls were breached there was no yielding or mercy. The victors were hacked to death.
If the Muslim/Jewish defenders would have defeated the Christians, it would have been Christians hacked to death. not really an atrocity in that time period, just the way it was.
Obviously during the smaller battles on the way into Jerusalem on the outskirts, there were probably skirmishes where Jews defeated Christians and hacked Christians to death. History doesn’t account for these small details, but they happen nonetheless.