Source: Warhammer Armies Project: Unofficial 9th Edition

Sally Forth!
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In case the attacking unit chooses to not attack the building after a failed assault, the defending unit may instead choose to sally forth (Frenzied units must pass a Leadership to restrain). This is treated just like assaulting a building, excepting that the now-defending unit is not automatically considered Steadfast and will flee as normal if they fail their Break test.

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