Disordered Artillery units cannot fire at all. Each unit fires individually, even if firing on the same target. By firing on an enemy unit you automatically suffer return fire with combat results being applied simultaneously. The final modified die roll will result in either no effect, the larget taking a cohesion check, suffering a disorder or routing. A cohesion check is a simple die roll cross checked with a unit's cohesion rating.
Failure leads to disorder.
A disordered unit is flipped to its reverse side. Such units have lower cohesion ratings, cannot fire or do so with a negative die modifier, pay an additional movement point to enter enemy zones of control and cannot use their higher movement allowance, even if the required distance from the enemy. A disordered unit suffenng a second disorder result routs. Routed units head for the nearest exit hex in the time honoured fashion unless rallied before leaving the battlefield. A ten sided die is again rolled with the result being modified by odds, terrain, cohesion, facing and if the defender is routed.