Snapped that off my Kindle – it is a chapter title half way into Epitaph: A Novel of the O.K. Corral – by Mary Doria Russell – Amazon
I thought, wow that is well worded. Google:
“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.”
Book 17, Illiad