Once you destroy the escorts the transport will be under your control. If it isn't under your control you need to kill more escorts. It is a scripted event, meaning as soon as the escorts are dead you will have control over Marcion's transport. I.e you will be able to select Marcion's transport like one of your own units as soon as all guards are dead.
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Divum Castellum Necessitas Humus Fundatio
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