Wartime fortification construction continues visibly through the night at accelerated pace

Evidence

In the direction of the distant Meuse, the opposite slope, in the gaps between the trees, whitened vaguely with a sort of momentary false dawn, a silky palpitation of soft, sluggish flashes, like the great bubbles of light that regularly burst over valleys of blast furnaces: these gleams were the concrete casemates being constructed on accelerated schedules, poured at night under arc lights. — Julien Gracq, Balcony in the Forest, 66

Categorization

• corroborated: 2 independent passages support this claim — Julien Gracq, Balcony in the Forest, 66