Effects of Force Marching on Fatigue

Whenever characters have failed a Constitution check as a result of force marching and are still in the process of recovering (see the
PHB, Chapter 14: Time and Movement, under Cross-Country Movement), they automatically begin the combat in a fatigued state rather than fresh. Fatigue points are consumed at the doubled rate and all the penalties for being fatigued (as well as the penalties for force marching) apply, until a state of exhaustion is reached. Furthermore, creatures cannot return to a fully fresh state during the battle; only the noncombat recovery period for force marching can remove this restriction.

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