On October 16 the Belgian army from Antwerp reached the Yser, and the British troops covering their retreat had arrived to the east of Ypres. Next day four divisions of the French cavalry drove out of the Forest of Hoethuist, north of Ypres, a German force which attempted to cut in between the Belgians and the British. Concurrently, the British line west of Lille was extended down the valley of the Lys as far as Frelingheinthree miles of suburbs from Laventie to Bois Grenier and Radinghem, the latter place not more than five miles from the centre of the city. Such broadly was the situation. The German attempt to overrun western Flanders had not failed merely; it had collapsed. CHAPTER V THE BATTLE OF YPRES--SECOND PHASE It is true that no line of demarcation divides the operations which resulted in the advance of the British army from St. Omer to Lille, and the operations which followed. Technically they are all one, for the fighting was continuous. At the same time it is advisable for the sake of clearness to consider those operations rather in the nature of a prelude, and the main Battle of Ypres as extending from October 17 to November 15, when the defeat of the Germans was complete. On October 17 the Allied forces were: the Belgians, who occupied the line of the Yser from Nieuport to Dixmude; two divisions of French territorials, the 87th and the 89th, who had also arrived on October 16 and were at Vlamertynghe and Poperinghe; the French cavalry, who held the ten miles of country between Dixmude and Ypres; the British troops under the command of General Rawlinson, who held a line to the east of Ypres extending from Poelcappel through Gheluvelt to Zandvoorde; the British cavalry under the command of General Allenby, who had pushed down to the valley of the Lys towards Werwick, three miles above Menin; and finally, the main body of the British force, the 3rd and the 2nd Army Corps, holding a line to the west of Lille from Le Ghier to Herlies, and from there south-west, through the village of Violaines, just outside La Bassee, to Givenchy. We may anticipate here by saying that on October 19 the detrainment of the 1st British Army Corps, under the command of General Sir Douglas Haig was completed at St. Omer; that on the same date the 10th French Army, under the command of General Maudhuy, reached the line between Ypres and Dixmude; and that on October 20 the first of the Indian troops, the Lahore Division, also arrived at the front. There were now three armies, the Belgians, the French, and the British, the latter consisting, with the Indians, of four Corps. The 10th French army included a division of Marines from Brest, and a Corps of Moroccans and Senegalese. This was the force, equivalent, with the two bodies of British and French cavalry, to some 320,000 men, on which fell during the ensuing four weeks, the weight of an attack by eighteen German army corps mustering in the aggregate nearly 1,080,000 of all arms.