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If you have a guard barracks in your town, then the head/defense leader can access the guards menu which allows you to enlist new guards (with consent), view the roster which shows guard activity, and issue commands (currently only ordering attacks and ceasing attacks). Ordering an attack is an ongoing event, and basically establishes the target as a wanted criminal who guards will attack at any point possible (within normal combat restrictions) until the target is incapable. Guards have to be inactive in order to auto attack, meaning guards with online players have to manually attack. For more information, view the wiki page in the link above.