A charging unit must move by the shortest route possible to reach its charge target. Therefore, charging units will often be obliged to move through difficult or dangerous terrain, or across low linear obstacles. This is perfectly acceptable, but a charge made through any form of terrain is more difficult, and often much slower, than a charge made across open ground.

Before making a charging unit's Charge roll, check to see if any part of the unit will move through difficult or dangerous terrain, or across a low linear obstacle, when it makes its charge move. If so, that unit must discard the highest result when making its Charge roll, rather than the lowest, and will suffer a -1 modifier to its Movement characteristic (to a minimum of 1) when making its charge move.

Finally, if a unit ends its charge move with a quarter (25%) or more of its models within difficult terrain, or straddling a low linear obstacle, it becomes Disrupted and cannot claim a Rank Bonus.