Yes, Toby's correct. The rule on page 43 says:
All of a command is broken when...[conditions are met]. It can then use its PIP only to:
- move a general who has not yet routed, and or
- halt groups or single elements that have not previously routed, for the current bound only.
All mobile land elements neither halted that bound nor in front edge combat must rout..."
(Emphasis and dot pointing added)
Once broken, you can either stand where you are, or run like the dickens. Once you start running, you don't stop, unless, for some obscure reason, an enemy element gets in the way of your path off the table (mind you, I did manage that once, and nearly lost the game as a result).