A Civil War fort north of the Ballure stream is mentioned in 1643 and listed in the inventories of 1694, 1702 and 1713 as the Danes' Fort. This name is thought to be significant and it may have re-used an earlier Iron Age/Viking earthwork.  By the mid 18th century 'only the vestiges of the ramparts and a few old unserviceable cannon' were seen. There is no evidence that the fort was renewed in 1757. 


From this it has been conjectured that this may have been the site of an Iron Age or Viking promontory fort.  The site has been lost to development and coastal erosion.  It was intact in 1820 according to Oswald who described it as being similar to that at St Marks 'the circular redoubts of both being high and strong and enclosed by a ditch'.