In the prelude to the prelude of the Second Battle of the Marne in 1918, we set the clock back to December 1917 to look at the position of the Allies at that point in the war. Specifically, we look at French Army commander General Philippe Petain's Directive No. 4 issued that month. In this short memo Petain advocated for a defense in depth strategy on the front lines, as Entente forces began to prepare for the inevitable German onslaught on the Western Front.

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