routing questions

[Merry Jolkar]

I don't want to risk losing a commander. If I have him retreat after he's fired of his volley of spells, will this affect the probability of my troops retreating (providing there are other commanders who will stay behind)?

Also, does a commander's command value have any direct influence on whether his troops will retreat?

I sometimes see troops who have routed return to battle (though they then seem to route easily), without any spells being cast. Why?

Finally, I have read that the probability of a troop retreating is lower if he or she is a member of a larger unit. How does that factor in to the retreat calculation? A unit is all the troops in one "row" under a commander, right?

Thanks, Merry