Source: Warhammer Armies Project: Unofficial 9th Edition

Accepting a Challenge
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If your opponent has issued a challenge, you can now accept it with one of your characters whose unit is in base contact with the unit containing the issuer of the challenge. Note that a character does not have to be in base contact with an enemy to accept or issue a challenge, just part of a unit that is. The two models will now fight, as described in Fighting a Challenge, below.

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