Everything about Vitrified Fort totally explained
Vitrified fort is the name given to certain crude stone enclosures whose walls have been subjected in a greater or less degree to the
action of fire. They are generally situated on hills offering strong defensive positions. Their form seems to have been determined by the contour of the flat summits which they enclose. The walls vary in size, a few being upwards of 12 feet high, and are so broad that they present the appearance of embankments. Weak parts of the defence are strengthened by double or triple walls, and occasionally vast lines of ramparts, composed of large blocks of unhewn and unvitrified stones, envelop the vitrified centre at some distance from it.
No
lime or
cement has been found in any of these structures, all of them presenting the peculiarity of being more or less consolidated by the fusion of the rocks of which they're built. This fusion, which has been caused by the application of intense heat, isn't equally complete in the various forts, or even in the walls of the same fort. In some cases the stones are only partially melted and calcined; in others their adjoining edges are fused so that they're firmly cemented together; in many instances pieces of rock are enveloped in a glassy enamel-like coating which binds them into a uniform whole; and at times, though rarely, the entire length of the wall presents one solid mass of vitreous substance.
It isn't clear why the walls were subjected to vitrification. Some antiquarians have argued that it was done to strengthen the wall, but the heating actually weakens the structure. Battle damage is also unlikely to be the cause, as the walls must have been subjected to carefully maintained fires to ensure they were hot enough for vitrification to take place. Currently, the most popular suggestion is that the process was a symbolic demonstration of power, spectacularly removing the seats of a warrior aristocracy.
Since
John Williams, one of the earliest of British
geologists, and author of
The Natural History of the Mineral Kingdom, first described these singular ruins in
1777, about fifty examples have been discovered in
Scotland. The most remarkable are:
- Dun Mac Sniachan (Dun Mac Uisneachain or Dun Macsnoichan), the ancient Beregoiium, Benderloch, north of Oban, ;
- Craig Phadraig, or Phadrick, near Inverness;
- Ord Hill, Kessock, near Inverness
- Dun Dhardhail (Dunjardil) in Glen Nevis;
- Knockfarrel (or Knockfarrail), near Strathpeffer, ;
- Dun Creich, in Sutherland, ;
- Finavon (or Finhaven), near Aberlemno ;
- Barryhill, in Perthshire;
- Laws, near Dundee, ;
- Dun Gall and Burnt Islands, in Buteshire;
- Anwoth, near Gatehouse of Fleet, ;
- Tap o' Noth, Aberdeenshire; and
- Cowdenknowes, in Berwickshire, .
Dun Mac Tjisneachain is the largest in area, being 250 yd. long by 50 yd. broad.
For a long time it was supposed that these forts were peculiar to Scotland; but they're found also in
County Londonderry and
County Cavan, in
Ireland; in
Upper Lusatia,
Bohemia,
Silesia,
Saxony and
Thuringia; in the provinces on the
Rhine, especially in the neighbourhood of the
Nahe; in the
Ucker Lake, in Brandenburg, where the walls are formed of burnt and smelted
bricks; in
Hungary; and in several places in
France, such as Châteauvieux, Péran, La Courbe, Sainte Suzanne, Puy de Gaudy and Thauron. They have not been found in
England or
Wales.
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