Citation? Even southern propaganda will do as a starting point.
also look up the memoirs of Leticia Clark Gomez of New Orleans for (her elder sister was one of the several NUNS who was assaulted at their convent in 1863.) a 1st person account.
i know you don't want to believe what federal troops did to INNOCENTS, particuliarly Roman Catholics & Jews, "the poorest of the poor", persons "of color" (particuliarly slaves!) AND recent immigrants; nonetheless the accounts are CORRECT!
the "filth that flowed down from the north" were MUCH better at ABUSING the helpless than they were at anything else.
the highest ranking union officer, that i know of, who was PERSONALLY involved in MASS ROBBERY & THEFT was MG Benjamin "The Beast" Butler, who sent BOXCAR loads of loot home to MA.
free dixie,sw