Olympian-Dannan War

The Olympian Dannan war was a conflict between the Greco-Roman gods (Olympians) and the Celtic gods (the Tuathe De Dannan), Greek and Roman demigods fought for the Olympians and the Celtic demigods fought for the Dannans.

The Celtic gods allied themselves with the pantheons of various other civilizations that had been oppressed by western civilization. Including Carthaginian, Inuit, Cherokee, Igbo, Voodoo, Hindu, Slavic, Aztec, Mayan, Taoist, and Shinto.

The deal the Dannans made was that the other pantheosn would support them in war if (and only if) they were able to significantly weaken both Camp Half-Blood and Camp Jupiter.

With their powers combined, these pantheons would be able to overwealm Olympus with their sheer force and numbers.