Source: Warhammer Armies Project: Unofficial 9th Edition

Bridges and Other Crossings
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Most rivers have at least one place at which they can be crossed, such as a bridge or a ford. Such crossing points should normally be treated as open terrain, but only if the unit attempting to use the crossing point is in a narrow enough formation to fit across, otherwise treat the entire unit as being in the river! Whether or not a unit is narrow enough will normally be fairly clear.

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