Napoleonic mechanics Fatigue

About Napoleonica: Steel and Magic, from BoardGameGeek:

Napoleonica is a hex-based wargame where history is mixed with fantasy. In this game you will have to lead one of the leading armies of the 18th century – French or the British Empire's army – to confront the evil-stricken Legions of Abyss. Napoleonica: Steel and Magic combines the basic elements of a classic hexagonal wargame with a system for issuing orders to units and playing Maneuver cards. Game rounds are divided into turns, during which you can perform one or two actions by activating your units. Players command armies of a variety of units including infantry, cavalry, artillery, and fantasy creatures. -description from the publisher