Before Sherman entered the city of Jackson, he had shelled it, like he would later do Atlanta. In fact he was running out of ammunition and had ordered another ammunition train from Vicksburg.

"…During the 12th and 13th, we threw into Jackson about 3,000 rounds,
mostly from 10 and 20 pounder Parrotts and 12-pounder Napoleons, all
of which did great execution…"

Report: General Sherman (USA) to General Grant (USA), Camp at Big Black River, July 28, 1863.

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David Upton