Ouvrage Hackenberg - Design and Construction

Design and Construction

The site was approved in stages by CORF (Commission d'Organisation des Régions Fortifiées), the Maginot Line's design and construction agency, between 1929 and 1932. Work by the contractor Enterprise de Travaille de Fortification began in 1929 at a cost of 172 million francs. A planned second phase was to add two 81mm mortar turrets and three more casemates on the back side of the ridge. Original plans called for a turret block with 155mm guns and another with long-range 145mm guns.More than 1,200 metres (3,900 ft) of underground galleries connect the entries to the farthest blocks 4 and 5, at an average depth of 30 metres (98 ft). An "M1" magazine, arranged with a horseshoe-shaped perimeter gallery connected by cross galleries between the legs, is located close to the ammunition entrance, while the large underground barracks and utility areas are just inside the personnel entry. The ouvrage is Y-shaped in plan, with the main gallery splitting in two almost 1,000 metres (3,300 ft) in from the ammunition entry. A 500-metre (1,600 ft) gallery runs to the principal combat blocks of the west wing, while the other passage runs another approximately 1,000 metres (3,300 ft) to the combat blocks of the east wing. The gallery system was served by a narrow-gauge (60 cm) electrified railway that continued out the ammunition entry and connected to a regional military railway system for the movement of materiel along the front a few kilometers to the rear.