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Fortified Sector of the Jura
The Fortified Sector of the Jura (''Secteur Fortifiée du Jura'') was the French military organization that in 1940 controlled the French frontier with Switzerland in the general area of Besançon. The area was lightly fortified, since the Swiss border was regarded as a low-risk frontier, save for the possibility of an advance from Germany through Switzerland into France. The Jura Mountains and the Doubs River presented natural barriers to invasion, allowing defenses to concentrate on a few points of potential access. The SF Jura was bordered on the east by the Fortified Sector of Montbéliard.
〔Mary, Tome 1, p. 15〕
==Concept and organization==
The sector's chief fortifications were old Séré de Rivières positions like the Fort de Joux, Fort de Larmont and the Fort Saint-Antione. A late effort in 1939-1940 constructed the CEZF Line, consisting of two sections of casemates. The northern section around Morteau consisted of four casemates, of fourteen proposed. The southern section around Pontarlier consisted of three completed of six casemates proposed. Road barriers were built at Goumois, La Goule, Biaufond and La Rasse. Crossings of the Doubs were fortified at Villiers-le-Lac, Morteau, Pont-de-la-Roche and La Cluse.
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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