Source: Warhammer Fantasy: 8th Edition

Different-sized Bases
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Most of the time, a character is mounted on the same size of base as the unit he decides to join. In this case, the character can simply be added to the front rank, displacing another model as described earlier. Naturally, this gets a little more involved if the character has a different-sized base to the members of the unit. Here we have to use a little common sense to make everything work.

If a character's base is larger than one model, but has exactly the same size area (or 'footprint') as two or more models, simply displace those models to the back rank and position the character in their place

For example, this Chaos Lord is riding a Chaos Steed, so has a 25mm x 50mm footprint. He can still join the Chaos Warrior unit, but will displace two models as the Chaos Warriors have a 25mm x 25mm footprint.

If your character(s) fit into the unit in this manner, work out the unit's ranks (and therefore its rank bonus) as if the space was filled with rank and file troops.

For example, all the units shown above have three complete ranks, and therefore a rank bonus of +2.

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