4th Ed Overrun attacks

[zaarin7]

IMHO Assault Movement is only done to get into the enemy hex. You have to use regular, one unit at at time with at most a leader and or passenger, movement to get into that hex adjacent to the enemy held occupied hex.

The optional rule on Extended Assault, which what you are discribing, speak in terms of moving a single unit. In the Overrun rule I do see where they wrote "...AFV (S) or cavalry..." so I see where the question is coming from. However a read of the entire section still IMHO looks like you move into the adjacent hex one at at time.