Fear is a natural reaction to huge or especially ugly and unnerving monsters. Some creatures inspire fear as indicated in the Armies books, including large and disturbing monsters such as Trolls as well as supernatural horrors such as Skeletons.
A unit must take a Fear test in the following situations:
1. If Charged by a Feared Enemy
If a unit is charged by an enemy that it fears then it must take make a test to overcome its fear. Test when the charge is declared and determined to be within its charge range. If the test is passed the unit can fight as normal. If the unit fails its test, and if is outnumbered by the charging enemy, it will flee. If the unit fails its test but is not outnumbered by the charging enemy it will fight as normal, but must roll 6's to score hits in the first turn of combat.
2. If a Unit Wishes to Charge a Feared Enemy
If a unit wishes to charge an enemy that it fears then it must take a test to overcome its fear. If the test is failed the unit may not charge and must remain stationary for the turn.