Among the animal images that Stephen Crane uses to define the fighting men in The Red Badge of Courage:
- Henry considers himself filled with "eagle-eyed prowess" (Chapter I)
- The new soldiers were referred to as "fresh fish" (Chapter I).
- The narrator described the enemy in the darkness that "moved like monsters" (Chapter II)
- The narrator repeatedly compared the invincible Confederate troops as "dragons."
- The youth saw the troops before him laid out in two long lines like "serpents" (Chapter II).
- The forms of his comrades looked "satanic" in the shadows (Chapter II).
- The Union skirmishers were "busy as bees" (Chapter III).
- Henry was worried that the Confederate troops would kill his comrades "like pigs" (Chapter III).
- War is referred to as the "red animal" (Chapter III).
- Henry also worried that if he cried out a warning to his regiment about the impending onslaught, he would "turn into a worm" (Chapter III).
- The regiment dug into ground "like terriers" (Chapter III).
- The retreating Union soldiers ran like "wild horses" (Chapter IV).
- The colonel of Henry's regiment began to "scold like a wet parrot" (Chapter V).
- Henry compared his "exasperation" as that of a "well-meaning cow worried by dogs" (Chapter V).
- His rage was like a "driven beast" (Chapter V).
- When he turned from the attack, Henry "ran like a rabbit" (Chapter VI).