Dunston Field, at the website of the Roman town near Caistor St Edmund, was closed last month to offer sheep a safe area to graze and to avoid dog poo issues.
However, rowdy walkers have actually disregarded cautions and vandals have repeatedly torn down signs.
Now authorities are performing routine patrols after a padlock on a gate to the field was broken and 4 indications were ripped down on 2 events.
One indication alerts of a pack of 4 or 5 dogs which charged at another puppy and informs walkers to keep their animals on a leash, while another informs owners to clean up their dog poo.
The website is owned by Norfolk Archaeological Trust, who state they are attempting to secure down on rule-breaking dog owners and make the area “safe for everybody”.
Following Wednesday night’s patrol officers said they enjoyed to see everybody utilizing the website properly, however advised those who see anything to email [email protected] or call 101.