Crane repeatedly uses animals to describe the regiment's fighting. What three animal image examples in the text?

The term "red animal" is used to name the war itself.

In Chapter Three, the regiment is described as digging into the ground "like terriers".

The Union soldiers retreating from battle in Chapter Four were described as running away like "wild horses".

Red animal is used to name the war. The regiment is described as digging into the ground
like terriers. The Union soldiers were described as running away like wild horses. Based on these images, I think that the author might describe courage as when you are strong enough to run into the flames and fight the enemy.