A defense committee, created July 28, 1872, develop a program of fortifications covering all borders, based on reports prepared by engineers of Engineering.

General Sere de Rivieres in 1872 says that we must create the border and to Paris defensive system taking into account the general conditions of modern warfare, staff put online, the importance of railways and progress of the artillery. The Act of July 17, 1874 fixed the fiscal framework.

The loss of Alsace Lorraine not only moves the border to the west but also fully opens to the invader, by the defection of the strongholds of Strasbourg and Metz. The eastern border is reorganized by creating a line of forts between the warring camps of Verdun, Toul, Epinal and Belfort. The defense rests on the northern boundary line of floods parts and strongholds of Lille and Maubeuge.
Un comité de défense, créé le 28 juillet 1872, élabore un programme de fortifications couvrant l'ensemble des frontières, en se basant sur les rapports établis par les ingénieurs du Génie.

A second line, evidenced by the amount of Champagne and the cliffs and based on the squares of Amiens, La Fere, Laon, Soissons, Reims and needs to close the conventional routes of invasion to Paris: the holes of the Oise the Aisne and Seine.


Finally, Paris and Lyon are reorganized into two great warring camps by adding a new ring of forts. The fortified camp of Paris should serve as a strategic axis between the railways of the East and the North.

This work continued until 1885, has 166 boxes, 43 books and 250 secondary batteries including 18 forts, redoubts 5 and 38 batteries in the Paris region.

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