Are units in defense also taken from the attacked location plus neighboring locations?
Is there a limit on the number of units in a squad?
Are mounts considered equipment?
Do abilities that grant guaranteed victory completely destroy the attacking squad or just block its action?
Yes.
No, this is countered by the fact that having only one squad can be tactically disadvantageous.
Mounts are purchased from merchants.
Renavan's destroys, Rainris's blocks.