"Christians don't do this"
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Emperor Karl (Charlemagne) in 782 had 4500 Saxons, unwilling to convert to Christianity, beheaded.
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Battle of Belgrad 1456: 80,000 Turks slaughtered.
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Crusades; Jerusalem conquered 7/15/1099 more than 60,000 victims (jewish, muslim, men, women, children). [WW37-40], Battle of Askalon, 8/12/1099. 200,000 heathens slaughtered "in the name of Our Lord Jesus Christ". [WW45]
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The list is longer than my arm!
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Harry 904 states, Destroying evil is actually "showing love" to ones enemy as well as "your neighbor".
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Which is evil, the ones being killed or those doing the killing.