Characters can always be found where the fighting is thickest. In combat, a character that has joined a unit:
May, if they are not within the fighting rank when their combat is chosen during Step 1.1 of the Choose Combat & Fight sub-phase, and starting with characters belonging to the inactive player, move through the ranks to join the fighting rank.
May, if they are within the fighting rank, make a number of attacks determined by their Attacks characteristic and their proximity to the enemy.
Can direct their attacks against, or divide them between, any enemy models they are in base contact with.
Can only be hit by enemy attacks (including Impact Hits or Stomp Attacks) that are directed against them, made by enemy models that are in base contact with them.
Can only have Impact Hits or Stomp Attacks directed against them if there are fewer than five rank and file models in the unit.
Note that characters adjacent to a fighting rank are considered to be within it.