The German defensive organizations, as well as I have been able to
establish, appear to be in general as follows:[3]
1. A continuous line of trenches over the whole front, comprising on a
limited depth two or three trenches, joined by numerous communicating
trenches (_boyaux_), and separated by 100 to 300 metres, each one often
protected by a wire entanglement.
2. Centers of resistance, comprising large villages, woods, or immense
field works, consisting of a network of trenches which are very strongly
organized and in which machine guns under cupolas as well as pieces of
artillery are mounted.
Such are, for example, the Labyrinth and _Ouvrages Blancs_ of Neuville.
These centers of resistance are separated by intervals of 800 to 1,500
metres; they mutually flank each other, and their intervals are
generally guarded by closed works.