The Iliad, Book 21

Trojans retreat, Achilleus rages, killing even those he knows.  Keeps 12 alive for later.  Begging does not stay him-- for death comes unfairly.  Finally, the river Xanthos (Skamandros) rises against him, and he is imperilled-- saved by Athene and Poseidon.  Xanthos rises again-- Hera sends Hephaistos to beat it back with fire-- Achilleus saved for good.  the gods quarrel-- Athene wins over Ares, Athene over Aphrodite, Poseidon and Apollo draw, Leto over Artemis.  Achilleus charges to the city.  Apollo inspires Agenor to stand fast, and strike a blow; then Apollo whisks Agenor to safety, taking his place, and leading Achilleus on a chase back to the river, while the remaining Trojans safely enter the city gate.