War: Is It Glory, or Hell? A Quote from Someone Who Knew

Just ran across this quote allegedly from Civil War general, William Tecumseh Sherman, famous/infamous, among other things, for his "scorched earth" tactics against the Confederate states.  He is supposed to have said, surveying the troops arrayed before him, "There is many a boy here today who looks on war as all glory, but, boys, it is all hell."  Sounds like someone who knew what he was talking about.