Source: Warhammer Armies Project: Unofficial 9th Edition

Flank Attack
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+1 combat result if your unit is fighting the enemy unit's flank.

Fighting a foe in its flank is a great advantage. The enemy warriors cannot easily turn to combat their attackers, and the sudden appearance of an enemy from an unexpected quarter has a psychological value all of its own. Therefore, if one or more of your units are fighting the enemy in its flank, you receive +1 combat result. If the enemy unit is engaged in both flanks, you receive +2 to the combat result instead.

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