As many as it took for them to realize that they have no right to rebel and commit treason.
the last go-round UNARMED civilians (like MY family for example) and HELPLESS CSA POWs were "the most favored target" of the bluebellies, especially those persons of "minority" racial/religious groups, as it was certainly easier & MUCH SAFER than fighting the valiant, ARMED, "lads in gray".
Confederate casualties of combatants outnumbered civilian casualties about 3-1. Again, your claims are not based on any facts.
"mysteriously disappeared", as in CHILE,UKRAINE, POLAND & NICARUAGUA.
NOTE to ALL: remember the damnyankee coven of WAR CRIMINALS around lincoln, the TYRANT & shyster railroad lawyer, INVENTED the CONCENTRATION CAMP.
damnyankee "bummers" were REALLY good at burglary,rape,robbery,looting, murder & other WAR CRIMES.
free dixie,sw