Saucer fleet
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A saucer fleet consisting of twelve Dalek saucers made up the Dalek Earthforce during the 2150s Dalek invasion of Earth. The Black Dalek's ship was the sole survivor of the fleet when Project Degravitate was thwarted. Badly crippled, the saucer was forced to make a slow return to Skaro, with the Black Dalek reporting the failure to the Dalek Prime. (PROSE: The History of the Daleks)