If the Sarissa-armed cavalry are attacked prior to their own first attack, double their melee strength. Continue this until the sarissa-armed cavalry make their own first attack. Prior to the first fire or melee combat, all units are moved normally. Sarissa-armed infantry subtract one from any die roll when they are defending against a fire attack. The affected units are tagged by a disruption marker.
Disruption never affects leader units.
All normal disruption rules apply. When units are stacked with a leader, subtract one from the die roll. If the defender elects to use defensive fire on the unit, add one to the die roll. Consult the Infantry Movement Table first, adding one to the die roll, and resolve the Defensive Fire second.