Three 2 deep units are in line of battle. The left hand unit is in combat with an enemy unit. The centre unit wishes to declare a charge on the flank of he enemy unit. However, to achieve this charge, the rearmost ranks will contact the right hand unit during the move.
Is this charge legal? In reality, the rearmost troops would not move to the right during this manoeuvre, but bases and movement trays make this happen in wargaming.