Never Back Down

If possible, a unit that includes a model with this special rule must issue a Challenge when Engaged in combat, and if an enemy player issues a Challenge to a unit including one or more models with special rule then a model with this special rule must accept. In addition, during any Assault phase where this model begins the Fight sub-phase Engaged in a Challenge, or enters into a Challenge with an enemy model, this model and all friendly models in the same combat gain the Fearless special rule until the end of that Assault phase.