After the battle.—The massing of enemy troops for counter-attacks is signalled to the artillery, which regulates its barrages accordingly, then, working in liaison, the two services "prepare" the ground for the next attack.
These tactics were, gradually perfected on the Somme battlefields, where the Germans learned by costly experience to improve their defences.
The offensive methods acquired also greater suppleness, and the new arm—the tank—came to the relief of the infantry.
GENERAL FAYOLLE INSPECTING THE CONQUERED LINES.
THE DOTTED ZONES REPRESENT THE GERMAN LINES OF RESISTANCE.