This psychological state produced a sort of fighting madness in many men, a superadrenalized fury that turned them into mindless killing machines heedless of the normal instinct of self-preservation. This frenzy seems to have prevailed at Antietam on a greater scale than in any previous Civil War battle. “The men are loading and firing with demonaical fury and shouting and laughing hysterically,” wrote a Union officer in the present tense a quarter-century later as if that moment of red-sky madness lived in him yet.43
