can unbreakables retreat?

[HJ]

Originally posted by rabelais:
Also if I mix unbreakables with normal troops, I assume I won't get ubermorale normal squads?

Just to add a question to this, if you don't mind:
If I mix the unbreakables with normal units, and normal units rout, but the army doesn't (it's just their squad that is routing), does that mean that they wil dissolve even if I have appropriate commanders or will they keep on fighting like berserkers do? I was never able to establish what happens here with certainty.