If they are not destroyed then fleeing units continue to move 2D6" or 3D6" towards their own side's table edge during their subsequent movement phases. They must attempt to leave the battlefield as quickly as possible. This is a 'compulsory move' so fleeing troops are moved before other troops once charges have been declared (see the Movement section).
A unit which is fleeing can do nothing else. For example, it cannot fight and it cannot shoot with missiles. Where there is room it will move round obstacles that block its path, including units of troops. Fleeing troops will not move towards enemy unless they have no other choice - if they are surrounded, for example.
If any models from a fleeing unit leave the table edge the entire unit is considered to have left the battlefield and is removed from play. Troopers have scattered beyond recovery or have found places to hide themselves until the battle is over.
If enemy troops charge a unit that is already fleeing then the unit automatically flees from the charge. The unit makes its 2/3D6" flee roll like any other unit fleeing from a charge. The charging enemy destroys the fleeing troops if it catches them in the same way as it would for a charge against any other fleeing troops. If they do not catch the fleeing troops then the charge is failed (see Movement for the rules relating to charges and charge reactions).