The Battle of P5Y-224 was the first direct engagement between the forces of the Liuo'opui Milky Way and those of the Ori, marking the beginning of the Ori crusade in the Milky Way with the battle itself taking place in March 2006 with the fight itself ultimately ending with the Ori forces winning against the combined forces, thus joining the Axis of Empires to fight them. Ever since the Ori made contact with the humans of the Liuo'opui Milky Way, the resources of their home galaxy had been turned to construction of a fleet with which to convert them.

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