O, courage, courage, princes! great Achilles
Is arming, weeping, cursing, vowing vengeance:
Patroclus' wounds have roused his drowsy blood, (5.5.30-32)
It turns out that the only thing that can "rouse" Achilles to action on behalf of his country is a very personal matter—the death of his best friend and lover, Patroclus. Well, we get that. But it's too bad he didn't get out of his tent earlier, right? Maybe Patroclus would still be alive.