Source: Warhammer Fantasy: 6th Edition

Models (War Machines)
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A war machine comprises the machine plus a crew, which is usually two or three crewmen. The crew are based separately, unlike with the model of a chariot or a ridden monster where the crew or riders are likely to be physically glued to the chariot or mount. This is necessary because a war machine's crew can be forced to flee from their machine, either because they are broken in combat or because they panic. Crew must be kept within 1" of the machine to count as crew.

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