Some troops have such high morale, or lack of individual willpower, that they never break.
Where your detachment has the Unbreakable ability:
The detachment can never become Broken.
|If you lose a close combat or firefight with the detachment then you must still make a Retreat move with it — unless it also has the No Retreat ability.|
1. Difference from Epic 40,000: We derived this ability from parts of Epic 40,000's Tyranid army 'Synapse Creatures' rules and War Engine 'No retreat, no surrender' rules. This allows for more flexibility in detachment design.