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The dread of Esnaur is one of the fortifications erected on the heights of Ascain, in the Pyrénées-Atlantiques, between the 4th quarter of the 18th century and the 1st quarter of the 19th century. It was designed to strengthen the French defensive system against Spanish threats, then Anglo-Hispano-Portuguese, particularly during the revolutionary wars (1793-1794) and the Napoleonic campaigns (1813). Located at 273 meters above sea level, it dominates the Pass de Saint-Ignace and adopts an irregular polygonal shape on seven sides, surrounded by a crown of 6 to 9 meters, partially dug in the rock.

The dread of Esnaur, like that of nearby Biskarzoun, was intended to house infantrymen and offer a strategic position to monitor enemy movements. Although it was not completed in November 1813, its high position and its alignment adapted to the terrain made it a difficult task to take on the front. During the Allied offensive of November 10, 1813, she seems to have been evacuated without combat, probably on the orders of General Taupin, commanding the French division deployed in the area. No evidence of resistance or confrontation was found, unlike other fears in the surrounding area.

Integrated with a network of more than twenty fortifications scattered over the municipalities of Ascain, Sare and Urrugne, Esnaur's dread illustrates the French defence effort to control strategic access to Bayonne and the Spanish border. Its architecture, combining summary construction techniques (fossed, dry stone parapets) and fine adaptation to the terrain, reflects the logistical and tactical constraints of the time. The region's fears, often linked by trenches, allowed for deep defence, although their isolation made them vulnerable in the event of an enemy breach.

The fighting of 1813, led by Marshal Soult against the troops of the Duke of Wellington, marked the end of the effectiveness of this arrangement. The dread of Esnaur, like many others, was abandoned during the French retreat towards Saint-Pée-sur-Nivelle, after the fall of key positions such as the dread of Zuhalmendi or the camp of Mouiz. Its inscription in the historical monuments in 1992 bears witness to its heritage importance, as a vestige of the conflicts that marked the Franco-Spanish border.

The site is part of a wider military landscape, where the heights of the Rhune and its foothills were the scene of decisive battles. The dreads, often built by reusing existing protohistoric structures or ruins, show adaptive ingenuity to limited resources. The dread of Esnaur, with its central ovoid platform and stadin walls, exemplifies this pragmatic approach, mixing ancient heritage and modern tactical needs.

Today, Esnaur's dread offers a material testimony to the defensive strategies of revolutionary and Napoleonic France. Its state of conservation, though partial, allows us to study the techniques of fortification of the period, as well as the role of the Pyrenean landscapes in border conflicts. Its ranking among historical monuments highlights its interest in military history and local heritage.

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