Source: Warhammer Fantasy: 7th Edition

Models (War Machines)
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A war machine comprises the machine plus a crew, which usually consists of two to four crewmen. The crew are based separately, unlike 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. These models must be kept within 1" of their machine to count as crewing it.

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