The Hill of Day Watch and Port of the Night Watch (Watch and Ward) for Jurby parish was at 'Knockmore' according to a document in the Castle Rushen Papers dated to 1627.  It has been suggested that the now lost burial mound of Cronk Mooar was the site of "Knockmore".  An alternative site at Cronk ny Arrey Lhaa, 0260.00, has been proposed. The majority of the Watch and Ward posts may well have been maintained on the same sites from the medieval period into the post medieval period.