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Ouvrage Sapey
Ouvrage Sapey is a work (''gros ouvrage'') of the Maginot Line's Alpine extension, the Alpine Line, also known as the Little Maginot Line. The ouvrage consists of one entry block, three artillery blocks and one observation block two kilometers west of Modane. The ''ouvrage'' was built beneath the older Fort du Sapey. The new work cost 12.8 million francs.〔Mary, Tome 4, p. 29〕
The ''ouvrage'' and fort were accessed by an aerial tram built in 1908, which also connected to Fort du Replaton, located down the slope from Sapey.
==Fort du Sapey==
The Fort du Sapey is the center of an ensemble of fortifications designed to protect Modane, the valley of the Arc and the terminus of the Fréjus Rail Tunnel to Italy, which was completed in 1871. The fort was built to the west of Modane at an altitude of about , on a hill that dominates the entire valley. The principal fort was built between 1884 and 1892 as part of the Séré de Rivières system. Construction was initially of stone, but concrete was added after the invention of high explosive made masonry construction untenable in fortifications. Additional work was undertaken in 1913, continuing until work stopped in 1916. The work reinforced magazines, batteries and shelters and excavated galleries for further shelters into the rock. A special battery was built and excavated into the rock to directly cover the end of the Fréjus tunnel. The entire ensemble was surrounded by a wall.
The position received a disproportionate amount of resources, considering the limited possibilities for enemy attack through the tunnel or over the Mont Cenis pass.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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