The situation of the armies on the Western Front at this time was as follows. In the neighbourhood of Lille the northern wing of the Sixth Army was fighting against an ever-increasing enemy. On 9th October, Antwerp, in spite of its strong fortifications and garrison, was taken after a twelve days' siege directed by General von Beseler, commanding the III Reserve Corps, and well known in peace time as Chief of the Engineer Corps and Inspector-General of Fortifications. The victorious besiegers had carried all before them. As they were numerically insufficient to invest Antwerp on the west, south and east, a break-through was attempted on a comparatively narrow front. It was completely successful, and Antwerp was occupied; but the main body of the Belgian army, in good fighting order, was able to escape westwards along the coast, to await the arrival of British and French reinforcements behind the Yser. Only about 5000 Belgians were taken prisoner, but some 20,000 Belgian and 2000 British troops[6] were forced into Holland. In consequence of this new situation, and of the reports of hostile concentrations in the area Calais-Dunkirk-Lille, the German General Staff decided to form a new Fourth Army under Duke Albert of Würtemburg. It was to be composed of the XXII, XXIII, XXVI, and XXVII Reserve Corps,[7] and was joined later on by the III Reserve Corps with the 4th _Ersatz_ Division. By 13th October the detainment of this new Army was in full progress west and south-west of Brussels. On the evening of 14th October the four Reserve Corps began their march to the line Eecloo (fifteen miles east of Bruges)--Deynze--point four miles west of Audenarde.