I've always been more of a Pap Thomas fan myself, but the unbalanced part makes sense. We also apparently patronized the same barber tradition at various points.
Sherman was an average tactician at best, but he understood that industrialized warfare, for all its formidable destructive capacity, is actually an integrated and fragile construct with numerous sinews that can be cut. He chose to cut them with a hammer.
[H/t to Marse Shawn for the find.]