I remember reading somewhere that Grant hated the sight of blood, so much so that he would request his steaks to be nearly charred before he ate them, this coming from the man who lost 50,000 soldiers in one battle, they didnt call him "Grant the Butcher" for nothing.

He also was apparently stone cold in the face of danger on the battlefield, barking orders at his soldiers as bullets quite literally wiz past him without him even flinching.