Achilles faced gods who helped the Trojan side, such as Apollo, Ares and Aphrodite, as well as demigods who were on the Trojan side such than Aeneas. Apollo caused a plague among the Greeks because Agamemnon captured one of the daughters of Apollo's priest and would not return her. Ares fought physically on the battlefield against the Greeks. Aphrodite pulled her son out of combat once he was injured. Achilles also received help from gods such as his mother, Thetis, Athena, Hera, Poseidon, Hephaestus, and Zeus. Thetis watched over Achilles and had new armor made for him so that he could return to battle after the death of Patroclus. Athena went to fight Achilles and protected him there. Hera distracted Zeus so that Poseidon could take the form of Calchas and encourage the Greeks. Hephaestus dried up Xanthus when he sued Achilles for putting Trojan corpses in the Xanthus River. Now, Zeus somehow worked on the Trojan side so that Achilles could punish Agamemnon for taking Achilles' prize, Briseis. Hector faced gods from the Greek side, like Athena, Poseidon, and Hera, as well as demigods, like Achilles. Athena gave Diomedes the ability to see the gods, which allowed him to attack and injure Ares. Hera distracted Zeus so Poseidon could encourage the Greeks, causing the Trojans to retreat. Beowulf confronts Grendel,