Sometimes a powerful unit is capable of smashing through an enemy in a single round of close combat. In such cases, the thundering charge of the victorious unit will sweep it forward as it cuts down its pitiful enemies.

In Warhammer this is represented by the Overrun rule. This rule stops individuals and small units from stopping a unit of charging Knights in its tracks, for example.

If all of a unit's opponents are slain in the first round of close combat then it is allowed to make an Overrun move as if it had broken its enemies. This will be 2D6" or 3D6" depending on the Movement value of the unit (like with fleeing and pursuit). The unit moves forwards in a direct line (ie, towards and through the position where the destroyed enemy unit was). Note that the victorious unit does not have to make the Overrun move – the player may elect to keep his troops stationary if he wishes.

Sometimes the Overrun move allows the unit to hit a fresh enemy unit. This is treated as if it were a new charge, and all the rules governing charges apply. In this case, the Overrunning unit has no choice in the matter, it must charge against the fresh enemy. The unexpectedly attacked unit can only respond to the charge by holding; any attempt to flee or stand & shoot is impossible. When moving an overrunning unit into contact with the enemy, the player must endeavour to bring as many models from the charging unit into combat as possible. This can usually be achieved by moving them straight forward, but it will sometimes be necessary to wheel the unit slightly to face the enemy.

If the new enemy or the overrunning unit causes fear or terror, neither unit has to make a Psychology test the overrunners are too exultant and the charged unit is too surprised! Note that psychology will apply as normal in subsequent turns – only tests required to charge opponents who cause fear or terror are ignored.

The resulting combat is worked out in the following turn. The overrunning troops are charging and so get all the usual benefits and bonuses, just as if they had charged that turn, even though their charge actually occurred during the Close Combat phase of the previous turn.

Assuming that overrunning troops do not encounter any fresh enemy, thy move the distance indicated by their dice roll and thereafter are ready to fight normally. So, in their following turn they may charge, march or move normally exactly like any other unit, and no penalty is imposed because of pursuing.