I see different values for "walk" and "run" on the units description but i'm unable to make a unit run. Some units look like they are already running (some archers or cavalry) but others seem to walk. Nevertheless i don't know how to change the state from walking to running. I've read at some manual that there should be a "stamina" blue bar that relates with running but i don't see this bar either. Could you give me some help? Thanks.