On August 8, the British and French launched an offensive in Picardy, pressed forward about seven miles on a front of 20 miles, astride the river Somme and captured several towns and 10,000 prisoners. It was in this engagement that the hard fighting at Chipilly Ridge occurred, in which the Americans so ably assisted, notably former National Guardsmen from Chicago and vicinity. Montdidier was taken by the French August 10. The British also continued to advance and by the 11th the Allies had captured 36,000 prisoners and more than 500 guns. A French attack August 19-20 on the Oise-Aisne front, netted 8,000 prisoners and liberated many towns. On the 21st Lassigny was taken by the French. This was the cornerstone of the German position south of the Avre river. On August 29 the Americans won the important battle of Guvigny. By September 2 the Germans were retreating on a front of 130 miles, from Ypres south to Noyon. By the 9th the Germans had been driven back to the original Hindenburg line, where their resistance began to strengthen. On September 12 the American army, led by General Pershing, won a great battle in the attack on and wiping out of the famous St. Mihiel salient. This victory forced the enemy back upon the Wotan-Hindenburg line, with the French paralleling him from Verdun to the Moselle. Pershing's forces continued fighting steadily, wearing out the Germans by steady pressure. On September 26 the Americans began another offensive along a front of 20 miles from the Meuse river westward through the Argonne forest. This developed into one of the bloodiest battles of the war for the Americans. On September 29 American and British troops smashed through the Hindenburg line at its strongest point between Cambrai and St. Quentin. British troops entered the suburbs of Cambrai and outflanked St. Quentin. Twenty-two thousand prisoners and more than 300 guns were captured. Meanwhile the Belgians tore a great hole in the German line, ten miles from the North sea, running from Dixmude southward. On October 3 the French launched three drives, one north of St. Quentin, another north of Rheims, and a third to the east in Champagne. All were successful, resulting in the freeing of much territory and the capture of many prisoners. On October 4 the Americans resumed the attack west of the Meuse. In the face of heavy artillery and machine gun fire, troops from Illinois, Wisconsin, Pennsylvania, Virginia, and West Virginia, forced the Germans back to the so-called Kriemhilde line. In the Champagne, American and French troops were moving successfully. On the 6th the Americans captured St. Etienne; on the 9th they reached the southern outskirts of Xivry and entered Chaune wood. On the same day the armies of Field Marshall Haig made a clean break through the Hindenburg system on the west. Through a twenty-mile gap, they advanced from nine to twelve miles, penetrating almost to the Le Selle and Sambre rivers.