On May 9th another attempt was made, and the Vindictive, filled with concrete was sunk in the Ostend channel.
This daring exploit of the English fleet, though it had destroyed the value of Zeebrugge and Ostend as submarine bases, had left the Germans in possession. In September, however, General Foch determined that the time had come to throw his armies against the German forces in the distracted little country. He planned two widely separated thrusts. On the south he sent Pershing against the Germans between the Argonne and the Meuse. They made rapid progress, capturing Montfaucon, Varennes and driving on until they had destroyed the German control of the Paris-Chalons-Verdun Railroad.
This was a serious blow to the Germans, for a further push northward would cut the vital lateral railway connecting the German armies in Belgium and France with those in Alsace-Lorraine. Ludendorf hastened reserves to this front, and the American operation was slowed down. Meanwhile at the other end of the line the Belgians, with General Plumer's Second British Army, suddenly attacked on a front which extended all the way from the canal at Dixmude to the Lys, swept the Germans out of all the famous fighting ground of the Ypres salient, pushed across the Passchendaele Ridge and down into the Flanders plain below.
The situation of the Germans in the Lille regions of the south and also along the Belgian coast became at once dangerous. Once more Ludendorf was compelled to send reserves, and this thrust began to slow up but it was not checked permanently, and the Belgian armies were to move on. While this advance was being conducted the British fleet were bombarding the coastal defenses. The Belgian army, fighting with the utmost spirit under command of King Albert, made a penetration of five miles and captured four thousand prisoners and an immense amount of supplies.
On September 30th they captured the city of Roulers. For ten days there was a consolidation of position by the Allies, but on October 14th they made a furious attack in the general direction of Ghent and Courtrai. Thousands of prisoners and several complete batteries of guns were captured. In this attack British, Belgian and French troops took part, and the troops of the three nations went over the top without preliminary bombardment, taking the enemy by surprise.
On October 15th the news from Flanders showed that the victory was growing in extent, the Allied armies were advancing on a front of about twenty-five miles, and in some places had penetrated the enemy's positions six or seven miles. The Belgians had captured seven thousand prisoners and the British and French about four thousand. In French Flanders the British advanced to a point about three miles west of Lille.
The battle was carried on in a heavy rain which turned the battle-fields into seas of mud; while this hampered the Allied troops it hindered even more the Germans in trying to move away their material through the mired ground of the Flanders Lowland.
On the next day dispatches indicated that a retreat on a tremendous scale in northern Belgium was under way. The Germans were retreating so fast that the Allies lost touch with the enemy. The gallant little Belgian army, assisted by crack British and French troops, had driven the despoilers of its country from a large section which the Germans had occupied since the early days of the war, and had gained positions of such importance as to make it probable that the Germans would have to abandon the entire coast of Belgium.
Moreover, on the south, the city of Lille, with the great mining and manufacturing districts around it, was being left in a salient which was growing deeper every hour and which the enemy could not hope to hold. At certain points the resistance of the Germans was extraordinarily fierce. This was especially true in the region of Thouret. The battle here was from street to street and from house to house. The Germans had placed machine-guns in the windows of houses and cellars and fired murderous streams of bullets into the advancing Belgians but were unable to stop them.
The Belgians fought with a dogged determination such as only troops fighting to regain their outraged country could display. Nothing could stop them. At other points, especially in the northern part of the battle area, the Germans surrendered freely. Many civilians were rescued from the towns and districts captured, and little processions of these were straggling rearward out of range of the guns, and out of the way of the fighting troops. At times liberated Belgian women could see their sons, brothers or husbands going forward into battle. On October 17th the German retreat in Flanders became a rout. The enemy were fleeing rapidly on their entire front. The British entered Lille.