At the start of each Chaos Compulsory Movement phase, roll a 1D6 for each Unruly unit. On a roll of a 1, the unit's headstrong nature has got the better of it. If there is an enemy unit that can be charged using the normal rules, the Beastmen must charge (charging the closest unit if there is more than one legal target). If no charges are possible, the unit moves as quickly and directly as possible towards the nearest enemy.