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The '''63rd Expedition Fleet''' was an [[Expedition Fleet]] created during the [[Great Crusade]] under the command of [[Horus]], the [[Primarch]] of the [[Luna Wolves]]. The fleet comprised of forces from the Luna Wolves [[Space Marine Legion]], the [[Byzant Janizars]] [[Imperial Army]] Regiment, the [[Legio Mortis]] [[Titan Legion]] as well as a large number of [[Remembrancer|remembrancers]]. The fleet rebelled against the [[Emperor]] and supported [[Imperial Guard Hierarchy#Warmaster|Warmaster]] Horus during the [[Horus Heresy]].