About: Defile (geography)   Sponge Permalink

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In a traditional military formation, soldiers march in rank (the depth of the formation) and files (the width of the formation), so, if a column of soldiers approach a narrow pass the formation must narrow which means that files on the outside must be ordered to the rear (or to some other position) so that the column has fewer files and more ranks. The French verb for this order is défilé, from which the English verb comes, as does the physical description for a valley that forces this manoeuvre.

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  • Defile (geography)
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  • In a traditional military formation, soldiers march in rank (the depth of the formation) and files (the width of the formation), so, if a column of soldiers approach a narrow pass the formation must narrow which means that files on the outside must be ordered to the rear (or to some other position) so that the column has fewer files and more ranks. The French verb for this order is défilé, from which the English verb comes, as does the physical description for a valley that forces this manoeuvre.
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abstract
  • In a traditional military formation, soldiers march in rank (the depth of the formation) and files (the width of the formation), so, if a column of soldiers approach a narrow pass the formation must narrow which means that files on the outside must be ordered to the rear (or to some other position) so that the column has fewer files and more ranks. The French verb for this order is défilé, from which the English verb comes, as does the physical description for a valley that forces this manoeuvre. Defiles of military significance can also be formed by other physical features that flank a pass or path and cause it to narrow, for example impassable woods and rivers. At the Battle of Agincourt a defile formed by the woods of Agincourt and Tramecourt caused a choke point for the French army and aided the English in their victory over the French. Some defiles have a permanent strategic importance and become known by that term in military literature. For example the military historian William Siborne names such a geographic feature in France near the frontier with Germany in his book Waterloo Campaign 1815:
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