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(p.

173) A MONTH ON THE RIDGE.
_April to May, 1917._ The great drawback to a victory in a war of movement, which we were told we were now engaged in, is that, after an advance, one has to follow up the line, and consequently, comfortable billets have to be exchanged for broken down shacks in the forward area.

Not many days after our men had taken Vimy Ridge, Divisional Headquarters had to move up to the Arras-Bethune road and occupy a chalk cave which was known as the Labyrinth.

It had once been the scene of fierce fighting between the French and the Germans.