The corollary in Flanders, unless it could be demonstrated, would be as great a failure as the main proposition in Picardy. And the still possible successful issue of the latter depended absolutely, as we shall see, on a complete demonstration of the former. Both have been so far handicapped by the augmenting mobility of the Allies, their growing numbers, their centralized command, and their successful insistence to control the air.
Such was the situation in Flanders and Picardy which confronted Ludendorff at the dawn of the second month of the German offensive. The whole problem to be solved was just as apparent to the Allies as it was to him—to gain the barriers which threatened his angles of penetration, in order again to utilize his preponderant forces of men and guns on a broad front. To attempt to extend the vertices without broadening the sides would mean to court danger, even destruction, at their weakest points.

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