That's an unfair and inaccurate characterization of Grant. There were lots of major battles with high casualties when Grant wasn't around. Grant's genius was to

That's an unfair and inaccurate characterization of Grant. There were lots of major battles with high casualties when Grant wasn't around. Grant's genius was to maneuver his army after the battle as if it had won. This freaked-out the Confederates, who had gotten used to score keeping by casualties, which never made any sense. In reality some of the battles in which the Union lost on the score were not really even tactical defeats. (Acting as if the battle was a defeat turned it into one.) Grant recognized he had the more powerful army, regardless of the score.