GITM Fatigue Chart

 
Event Fatigue gain
Move strategically in mountains +2
Move strategically in all other terrain +1
Move tactically with enemy units present +1
Force-march strategically in mountains +4 (+5 for cavalry, light artillery)
Force-march strategically in all other terrain +3 (+4 for cavalry, light artillery)
Fire in firing phase +1
Engage in melee phase +1
Rout from combat +4 (+5 if into mountain)
Retreat from combat +2
Fall back from combat +1

At the end of each turn:
Infantry, heavy and medium artillery, and corps HQ units lose 3 fatigue points
Cavalry, light artillery, and army HQ units lose 4 fatigue points

Units cannot move strategically with fatigue of 19 or greater
Units cannot move tactically with fatigue of 9 or greater
Units cannot initiate combat with fatigue of 9 or greater
Units in combat surrender automatically with fatigue of 16 or greater