First Giant War

The Gigantomachy is the symbolic struggle between the Olympians, led by Zeus, and the Giants, led by the giant Eurymedon.

The War
The cause of Gigantomachy was the defeat of the Titans by the gods, so the giants went war against the Gods for revenge, as ordered by their mother Gaea, Led on by Porphyrion, Eurymedon, Polybotes and Alcyoneus. The giants Otus and Ephialtes hoped to reach the the top of Olympus by stacking the mountain ranges of Thessaly, Pelian and Ossa on top of each other.

The Olympians called upon the aid of Heracles after a prophecy warned them by Hera, that aid of a son of a mortal mother would be needed. Athena, instructed by Zeus, sought out Heracles and requested his participation in the battle.

The Olympians fought the giants with the Moirae aiding them before the after mentioned prophecy was made, meaning the giants would have overcome them, if Hearcles hadn't fought.

Thus, in the Gigantomachy, the Moirae and Heracles and hecate, along with the Olympians deafeated the giants. The only giant not slain in the conflict was Aristaios, who was turned into dung beetle by Gaea so the giant might be safe from the wrath of Olympus.

The names of the Giants
Some of the giants identified with individual names:
 * Eurymedon: leader of the giants
 * Alcyoneus: one of the strongest giants, killed by Heracles.
 * Porphyrion: one of the strongest giants, wounded by Zeus and killed by Heracles(later brought back to life).
 * Agrios: killed by Moirae, with clubs of bronze.
 * Clytius: Immolated by Hecate with flaming torches.
 * Enceladus: killed by Athena(later brought back to life).
 * Ephialtes of the Aloadea: shot by Apollo and Heracles with arrows.
 * Eurytus: killed by Dinoysus, with his pine cone tipped Thyrsos.
 * Gration: killed by Artemis, with her arrows.
 * Hippolytus: killed by Hermes, while wearing the invisibility cap.
 * Mimas: killed by Hephaestus with a volley of molten iron.
 * Otus of the Aloadea: shot by Apollo and Heracles with arrows.
 * Pallas: killed by Athena.
 * Polybotes: crushed by Poseidon beneath the island of Nisyros.
 * Thoon: killed by Moirae, with clubs of bronze.