I got it in the end. I missed the sentence "If it cannot deal any defending groups damage, it does not choose a target". A simple extra clause in the target selection:
if (defendingGroup == null) ...
became
if (defendingGroup == null || defendingGroup.damageFrom(attackingGroup.unit.attack) == 0) ...
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I got it in the end. I missed the sentence "If it cannot deal any defending groups damage, it does not choose a target". A simple extra clause in the target selection:
became