About: Carnot wall   Sponge Permalink

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In this period the design of fortifications was based on the bastion "trace" or ground-plan. This had originated in Italy in the 16th century. From the late 17th century the model system of fortification was considered to be that based on the bastion trace of Vauban, Louis XIV's military engineer. Carnot opposed the Bastion system. The elements of his system were: * vertical fire from mortars; * a countersloping glacis; * sorties by defenders; * the "Carnot" wall and; * separation of defence and attack.

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  • Carnot wall
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  • In this period the design of fortifications was based on the bastion "trace" or ground-plan. This had originated in Italy in the 16th century. From the late 17th century the model system of fortification was considered to be that based on the bastion trace of Vauban, Louis XIV's military engineer. Carnot opposed the Bastion system. The elements of his system were: * vertical fire from mortars; * a countersloping glacis; * sorties by defenders; * the "Carnot" wall and; * separation of defence and attack.
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abstract
  • In this period the design of fortifications was based on the bastion "trace" or ground-plan. This had originated in Italy in the 16th century. From the late 17th century the model system of fortification was considered to be that based on the bastion trace of Vauban, Louis XIV's military engineer. Carnot opposed the Bastion system. The elements of his system were: * vertical fire from mortars; * a countersloping glacis; * sorties by defenders; * the "Carnot" wall and; * separation of defence and attack. A conventional fort would have ramparts on which the cannon were mounted. The ramparts were surrounded by a ditch with vertical, or near vertical, sides, called the scarp (inner wall) and counterscarp (outer wall). The outer side of the ditch would have a glacis, a gently outwardly sloping earth bank at a slightly lower level than the ramparts. The glacis would be topped by a parapet with a flat area called the "covered way" (because it was "covered" by fire from defenders on the ramparts). This arrangement was intended to make it difficult for attackers to approach the fort while allowing defenders to observe, and fire on, approaching besiegers at some distance from the fort. As against this method Carnot's system did away with the covered way and steep counterscarp and made the glacis slope back into the ditch. (This is referred to as a countersloping glacis). He placed a loop-holed wall in the ditch of the fortification. This had a chemin des rondes, or sentry path, to the rear allowing defenders to move along behind the wall. As well as firing at attackers the defenders were able to make sorties from behind the wall up the countersloping glacis.
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