In March 1917, in a tactical move, the Germans moved back to the Hindenburg Line but left much destruction in their wake and the areas which they vacated were then occupied by the allies.
The Germans moved back to the Hindenburg Line. This was in a tactical move. This was in March 1917. The Germans left much destruction in their wake. This was in a tactical move. This was in March 1917. The areas were then occupied by the allies. This was in March 1917. They vacated these areas.