St. Quentin
With retreat all long the line, the commander-in-chief of the French forces, Joseph Joffre, held off the German advance through counterattacking. This was only done with the help of the Fifth Army under Charles Lanrezac.
On 29 August, the French Fifth Army attacked St. Quentin with its full force. Possessing orders captured with a French officer, Bülow was already aware of the counter-offensive and had time to prepare. The attacks against the town by the eighteenth corps met with heavy casualties and little success, but the tenth and third corps on the right flank was rallied by the commander of the first corps, Franchet d'Esperey. Advances on the right were made successfully against the Germans with Guise falling back, in addition to units of the Guard Corps and Bülow's elite.
The next day, the French continued the retreat back to the Marne, with the Germans refraining from following.
Read more about this topic: Great Retreat