Brigadier-General James Edmonds, the British official historian, wrote in the History of the Great War, that the II Corps battle at La Bassée could be taken as separate but that the battles from Armentières to Messines and Ypres, were better understood as one battle in two parts, an offensive by III Corps and the Cavalry Corps from 12 to 18 October against which the Germans retired and an offensive by the German 6th Army and 4th Army from 19 October to 2 November, which from 30 October, took place mainly north of the Lys, when the battles of Armentières and Messines merged with the Battles of Ypres.