A good Overview and Informations about Guard Posts you can find also here,check section "Guard Posts".
Up to 5 Treasure Maps with random level. (The higher the level of the Outpost, the greater the chance on a higher Map).
Ring of Guard Post Commandant:
— award for for capturing a guard post
— blessed (newbie), has 999 charges
— gives +1hp regeneration
— +30 to all stats
— +15 to magic defence
— Disappears after 24hours.