Diagram of the 'modern fire trench' with bays between traverses, from Edmund Dane's book "Trench Warfare", 1915 :

Saved in:
Bibliographic Details
Corporate Authors: 1915 (Author), Adam Matthew Digital (Firm) (digitiser.)
Format: Electronic
Language:English
Published: Marlborough, Wiltshire : Adam Matthew Digital, 2011.
Online Access:Click for online access