Why did the German forces which were confronting us and on the evening before attacking so furiously retreat on the morning of the 10th? Because in bringing back on the 6th several army corps from the south to the north to face our left the enemy had exposed his left to the attacks of the British Army, which had immediately faced around toward the north, and to those of our armies which were prolonging the English lines to the right. This is what the French command had sought to bring about. This is what happened on September 8 and allowed the development and rehabilitation which it was to effect.
The part of the British.
On the 6th the British Army had set out from the line Rozcy-Lagny and had that evening reached the southward bank of the Grand Morin. On the 7th and 8th it continued its march, and on the 9th had debouched to the north of the Marne below Château-Thierry, taking in flank the German forces which on that day were opposing, on the Ourcq, our left army. Then it was that these forces began to retreat, while the British Army, going in pursuit and capturing seven guns and many prisoners, reached the Aisne between Soissons and Longueval.
The rôle of the French army.
The rôle of the French Army, which was operating to the right of the British Army, was threefold. It had to support the British attacking on its left. It had on its right to support our centre, which from September 7 had been subjected to a German attack of great violence. Finally, its mission was to throw back the three active army corps and the reserve corps which faced it.
On the 7th it made a leap forward, and on the following days reached and crossed the Marne, seizing, after desperate fighting, guns, howitzers, mitrailleuses, and 1,300,000 cartridges. On the 12th it established itself on the north edge of the Montagne-de-Reime in contact with our centre, which for its part had just forced the enemy to retreat in haste.
Attack on the French centre.
Our centre consisted of a new army created on August 29 and of one of those which at the beginning of the campaign had been engaged in Belgian Luxembourg. The first had retreated on August 29 to September 5 from the Aisne to the north of the Marne and occupied the general front Sézanne-Mailly.
The second, more to the east, had drawn back to the south of the line Humbauville-Château-Beauchamp-Bignicourt-Blesmes-Maurupt-le-Montoy.
A further retreat.