If some of the creatures pulling a chariot are slain then it will move proportionately slower. For example, a chariot pulled by two horses normally travels 8" but this is reduced to 4" with only one horse as half the horses have been slain. Obviously, the more creatures there are to pull the chariot the smaller the proportional reduction in its movement should they be slain. Should all the creatures be slain then the chariot is brought to a halt.