All units that are still in B2B with an opposing unit that has a weapon skill are locked in combat.
you fight a round of close combat in each players assault phase.
So basically you move, shoot and launch an assault, fight 1 round of combat starting at Initiative 10, and going down to Initiative 1 with all models involved attacking on their Initiative. then you determine combat resolution, and if neither of the units are falling back or destroyed they will have to wait until the next players assault phase to attack again.
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