Achnasoul and Medieval Earthwork Castles in Ross Revisited

by Meryl Marshall

The moated homestead in Achnasoul Wood (NGR NH 48808 51821 Canmore ID: 274702 Highland Council (HC) HER MHG29192) 4kms west of Muir of Ord was visited by NOSAS members on a winter walk in February 2020 just before “lockdown”. The visit renewed my interest in the medieval period in this area and I began some research into the two homesteads of Davids Fort and Achnasoul with the intention of producing a blog for the NOSAS website. It wasn’t long before I realized what a complex topic I had taken on so I decided to split it into two; the first part, on Davids Fort, appeared on the NOSAS website in May 2020, this piece, focusing on Achnasoul, is part two.

The eastern half of the site showing the ditch and double banks with the mound on the right – looking SE

The Achnasoul site is a ringed earthwork with a central mound which was originally interpreted as a “moated homestead” but recently confirmed (on Canmore) as a motte and bailey. It is remarkably well preserved and has been one of my favourite local sites for many years. NOSAS carried out a planetable survey on a cold, wintery day in 2005 (report on NOSAS website at: www.nosas.co.uk/siterecords.asp.) The site remains something of a mystery and seems out of place; clearly it is fortified as it has substantial double banks enclosing a ditch but yet it is situated in low lying ground with higher knolls surrounding it – not a particularly defendable position!

In 2017 the site was scheduled by Historic Environment Scotland (HES) – SM13629. The description in the scheduling document says:               

The monument is a large earthwork enclosure comprising a ditch and two concentric banks which enclose a sub-circular area measuring around 43m northwest-southeast by 39m northeast-southwest within which is a raised mound. The ditch defining the enclosure measures 4m to 5m in width and 1.5m in depth and is broken by two causeways on the northwest and southeast. The outer bank of the ditch is complete and varies in height, reaching a maximum of 2m… Internally, the raised mound lies in the northern part of the enclosed area and is c25m diameter at its base, reaching a maximum height of 2m. The summit is encircled by a fragmentary bank, which encloses an area of around 11m diameter.

The size and form of the visible remains… represents a rare survival of a moated homestead of medieval date.

A processed image of the Achnasoul site from a lidar survey (contains public sector information licensed under the Open Government Licinse v3.0)

David’s Fort Revisited – and a Strange Coincidence?

By Meryl Marshall

With movements restricted due to the coronavirus pandemic it was inevitable that I would find myself at David’s Fort, near Conan House, just 2kms from my home. This impressive earthwork, variously interpreted as a “motte”, a “moated homestead” (OS map) and a “moated site” has received lots of attention from NOSAS in the past, see Marion Ruscoe’s blog of 2016, but the site remains as mysterious as ever. I was pleased to see that the area is much more open than it used to be, but the surrounds are rapidly becoming overgrown with scrubby brambles, broom and whins. The visit set me thinking once again about the origins and history of the site, with more time at home I set about some online investigations.

David’s Fort (Canmore ID: 12866, Highland Council HER: MHG8986) is at NGR NH 5394 5328 and consists of an impressive wet ditch 4m deep enclosing a trapezoidal area measuring 25m from N to S and 26m to 32m transversely. The ditch is enclosed by an external bank standing up to 3m height but 1.5m externally. Internally the only feature visible is a circular depression 7m in diameter and 1m in depth in the western half; traces of what may have been a bridge spanning the ditch on the west side have also been reported (June 1979) The moat still contains water and was originally fed by a waterway running from an artificially constructed pond possibly of more recent origin 100.0m to the east, to a cut in the bank at the NE corner.

The site is located on the forested slope above the River Conon 1km to the east of Conan House. It is close to what, in the Medieval period, was a crossing of the River Conon. Here too was the old church of Logiebride (or Logie Wester), and the site of the Battle of Lagabraad in 1481. This area, at the “neck” of the Black Isle, will almost certainly have been a meeting point of routeways for centuries, if not millennia.

David’s Fort looking SW

A processed image of Davids Fort from a lidar survey (contains public sector information licensed under the Open Government Licence v3.0) © A Thompson. This model has also been uploaded to Sketchfab and can be seen in 3D at https://sketchfab.com/3d-models/davids-fort-d26cbff5d5184af18d157f7b6be94dad

David’s Fort: a Medieval Motte?

by Marion Ruscoe (NOSAS)

In around 2000 Janet Hooper, Allan MacKenzie and I undertook a survey of David’s Fort, a rather enigmatic site in Balavil Wood, near Conon Bridge.  Our intention was to survey the site, clarify its purpose and investigate the related documentary and contextual information.  We did arrange a geophysical survey which was cancelled due to Foot and Mouth, and that was replaced with a later walkover of Balavil Wood.  David’s Fort itself is scheduled, but there are other features in the immediate area which may be related and which are worthy of notice.

David’s Fort aerial photograph by Jim Bone

David’s Fort (NH5394 5328; HER MHG8986) is essentially a large earth mound surrounded by a ditch, surrounded by an embankment.  The mound and embankment were created by digging out the ditch.  It’s trapezoidal in shape, and the top of the mound measures approximately 80 x 85 feet.  The moat is around 15 feet deep and is partially filled with water.  There’s no sign of any structures on the top of the mound, but these would probably have been wooden and evidence would not have survived the trees and bracken which have invaded the site.

There is a dip on the west end and a corresponding dip in the embankment with a track running down to the mediaeval road which runs from Tarradale on the Beauly Firth to the ford over the River Conon.  It’s been assumed that this is where the entrance was, though, since the embankment is considerably lower than the top of the mound, any bridge would either be very sloped, or mounted on a framework which raises the question “why the dip in the embankment and the very obvious path leading from that dip?”  The embankment surrounding the mound has been extended for a short distance at three of the corners.  The purpose of this is not clear.  Water was fed into the moat via a channel leading from a lochan to the east of the site and controlled by a sluice but this channel has been damaged by the embankment which carries the power lines.

Dip in embankment, indicating possible original entry. 1998