You are aware that was over 600 years ago, the mass atrocities today far outweigh those of yesteryear, the intense violence and horror of modern weaponary cannot be put into words.
If anything, the weapons of yesteryear were far MORE attrocious, they had much less killing power, and many people laid on the battlefield dieing slow painful deaths because they didnt have the modern medicine to save them, today US medics and corpmen will actually care for and try and save many wounded enemies.
Todays weapons have much more killing power, so that enemy combatants are not left alive slowly bleeding out.
To say todays attrocities outweigh those of the past is an ignorant statement, today we have rules, geneva convention etc, of course shit still slips by the cracks, but by and large its 100x better.
In the past, they tortured/raped/killed entire civilizations, - men, women, children, animals - etc as a normal occurance, many times taking the women for their slaves.