So on they fought like a swirl of living fire –
you could not say if the sun and moon still stood secure,
so dense the battle-haze that engulfed the brave
who stood their ground to defend Patroclus’ body.

– Homer

The Iliad, Book 17, lines 423-426. Using a fire simile, Homer tells us about the intensity of the battle by the Greeks to protect the body of Patroclus, after giant Ajax orders them to cluster around it.