By November 10 the cavalry, supported by a few battalions of the Second Corps, had taken over a line west of the Messines Ridge, and on the left of the Third Corps. From the Douve southward to La Bassée the line was approximately established as it remained through the winter of 1914-15, the Third Corps being astride the Lys, while the Fourth Corps (the Eighth Division, which had by this time arrived) continued the line from about Bois Grenier to beyond Neuve Chapelle, the Indian Corps being on the right. D. _November 11 to 20_: November 11 was the next most critical moment of the battle after October 31; on this day took place the great attack of the Prussian Guard, which broke through the line of the First Division near Veldhoek and penetrated into the Nonne-Bosschen, but was checked there, and then dislodged by a counter-attack by the 52nd Oxfordshire Light Infantry, perhaps the most dramatic of all the individual episodes of the battle. On this day the line of the Third Division south of the Ypres--Menin road was also violently assailed, and some ground was lost; but the net result of the day was the failure of the great German effort to break through, and from that moment the fighting north as well as south of the Lys tended to diminish in intensity. The Germans made a few more attacks, but none in such strength or determination as those of October 31 and November 11, and about November 15 the French began to take over the positions in "the Ypres salient," so obstinately defended by Sir Douglas Haig for nearly four weeks. It may be gathered from the accounts of the fighting of the subsequent months that the Germans were for the moment exhausted, that their supplies of ammunition were running low, and that the attack of November 11 represented their last bolt--until more could be forged. Thus if the Allied effort to outflank the German right and roll up their line had been unsuccessful, defensively the first battle of Ypres was a great success, the German effort to break through being definitely and decisively defeated. November 20 may be taken as the end of the battle, as it was on that day that the last unit of Sir Douglas Haig's command was relieved by the French, the British line then extending approximately from Givenchy in the south to Keniwel in the north. During this fourth phase the operations on the line from the Douve to the La Bassée Canal had been of the character of "normal trench warfare," neither side attempting any major operation. [Sidenote: Oct. 15.]