The fifth and last phase of the great offensive which the Germans had started in March, began July 15, in an attack from Chateau Thierry to Massignes, along a sixty-five mile front and crossing the Marne at several places. At Chateau Thierry the Americans put up a strong resistance but the enemy by persistent efforts finally succeeded in getting a footing on the south bank. The battle continued east and west of Rheims with the Allies holding strongly and the Germans meeting heavy losses.
While the Germans were trying to force their way regardless of cost, in the direction of Chalons and Epernay, General Foch was preparing a surprise in the Villers-Cotterets forest on the German right flank. In the large force collected for the surprise were some of the best French regiments together with the famed Foreign Legion, the Moroccan regiment and other crack troops including Americans. On the morning of July 18, a heavy blow was launched at the Germans all along the line from Chateau Thierry on the Marne to the Aisne northwest of Soissons.
The foe was taken completely by surprise and town after town fell with very little resistance. Later the resistance stiffened but the Allies continued to advance. Cavalrymen assisted the infantry and tanks in large numbers, helped to clean out the machine gun nests. The Americans who fought side by side with the French won the unbounded admiration of their comrades. Thousands of prisoners were taken with large numbers of heavy cannon, great quantities of ammunition and thousands of machine guns. By the 20th Soissons was threatened. The Germans finding themselves caught in a dangerous salient and attacked fiercely on both flanks, retreated hurriedly to the north bank of the Marne and still farther.
Meanwhile things were going badly for the Austrians. After its retreat in 1917 to the line of the Piave river, the Italian army had been reorganized and strengthened under General Diaz, who had succeeded General Cadorna in command. French and British regiments had been sent to assist in holding the line, and later some American forces.
The Austrians began an offensive June 15 along a 100-mile front, crossing the Piave in several places. For three days they made violent attacks on the Montello plateau, and along the Piave from St. Andrea to San Dona and at Capo Sile, twenty miles from Venice. Then the Italians, British, French and Americans counter-attacked and within three days had turned the great Austrian offensive into a rout, killing thousands, taking thousands of prisoners, and capturing an immense amount of war material including the Austrian's heavy caliber guns. The whole Austrian scheme to advance into the fertile Italian plains where they hoped to find food for their hungry soldiers, failed completely. It was practically the end of Austria and the beginning of the end for Germany. Bulgaria gave up September 26, due to heavy operations by the French, Italians and Serbians during July, August and September, in Albania, Macedonia and along the Vardar river to the boundaries of Bulgaria. They signed an armistice September 29 and the king of Bulgaria abdicated October 3. Turkey being in a hopeless position through the surrender of Bulgaria, and the success of the British forces under General Allenby, kept up a feeble resistance until the end of October when she too surrendered. The collapse of Austria-Hungary followed closely on that of Turkey. They kept up a show of resistance and suffered a number of disastrous defeats until the end of October when they raised the white flag. An armistice was signed by the Austrian representatives and General Diaz for the Italians, November 3.
On the anniversary of Britain's entry into the war, August 4, Field Marshall Haig, commander-in-chief of the British forces issued a special order of the day, the opening paragraph of which was:
"The conclusion of the fourth year of the war marks the passing of the period of crisis. We can now with added confidence, look forward to the future."
On August 4, General Pershing reported:
"The full fruits of victory in the counter offensive begun so gloriously by Franco-American troops on July 18, were reaped today, when the enemy who met his second great defeat on the Marne, was driven in confusion beyond the line of the Vesle. The enemy, in spite of suffering the severest losses, has proved incapable of stemming the onslaught of our troops, fighting for liberty side by side with French, British and Italian veterans. In the course of the operations, 8,400 prisoners and 133 guns have been captured by our men alone. Our troops have taken Fismes by assault and hold the south bank of the Vesle in this section."
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.