Say my warriors charge and engage 3 out of 6 models from an enemy archer squad. Obviously during this round, the engaged models must now fight back, hold their action, or become exhausted.
Is this also the case for the models in the archer squad that weren't engaged?
Say the next round, my opponent has the initiative and he activates this archer squad first. Can the three unengaged models still shoot while the three engaged models fight in melee? Or is engagement really on a squad level?