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The Battle of Cassius took place near the planet of Cassius beyond Pluto's orbit. This happened after the First Doctor's defeat of the Dalek's plot to turn occupied Earth into a mobile warship which resulted in the occupation force being crippled. (DW: The Dalek Invasion of Earth) At the conclusion of the battle, the Dalek's solar system blockade was shattered, forcing them to leave Earth. (NA: Love and War)