Sir Hubert Gough's army was sent down in January to take over from the French a sector forty to fifty miles long. Clearly such a line as this could be held only if it were strongly located and cunningly constructed, and there is no doubt that it was. Three lines were designed: First, an outpost line, then a "line of resistance," and then a "battleline." The outpost line was designed with special care. It consisted of a number of separate posts so located as to provide for a cross-fire on any enemy that penetrated them. It was intended to be held until the last gasp, and it was presumed that the Germans might pass through it, but that they would be terribly punished by the garrisons of the isolated posts.
In one way the attack was not a surprise. General Gough had known for days that it was imminent, and had moved his men up to their positions and made every preparation possible. But one thing he could not foresee or guard against—the mist and fog.

License information: nan
MPAA: G
Go to source: http://www.gutenberg.org/files/38750/38750-h/38750-h.htm#Page_219