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.