Retreat
A hero may retreat when facing another hero or facing wandering creatures.
A hero loses his army when he retreats.
The defending hero may not retreat from a town fight. There is one exception. An Escape Tunnel in a Stronghold allows the defending hero to retreat.
Retreating (or surrendering) is a good idea
- where defeat is imminent
- as a means to travel to a distant town (upon being bought in that town's tavern)