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Use this Stratagem at the start of the Fight phase. Select one DARK ANGELS INFANTRY unit from your army. Until the end of the phase, that unit can only be selected as a target for melee
attacks if the attacking model is within Engagement Range of it (note that this means that enemy models that are not within Engagement Range but are within 1/2" of a model from their own unit that is itself within 1/2” of this DARK ANGELS INFANTRY unit cannot target it with melee attacks this phase).