Colonel List, General von Stetten, on the 29th, carried forward the attack against GHELUVELT, the key of the enemy's position. More than 600 British prisoners and 5 machine-guns were taken by our victorious cavalry.[47] Simultaneously on this day, the troops of General von Stetten filled another rôle. They were covering the concentration of new German forces which was in the course of completion behind their battle-front. THE ATTEMPT TO BREAK THROUGH SOUTH OF YPRES Throughout the fighting of the Fourth Army during October, the Sixth Army under Crown Prince Rupert of Bavaria had remained on the offensive on the line ARRAS-LA BASSÉE--east of ARMENTIÈRES;[48] but although fresh reinforcements had been sent up to that part of the front by the German General Staff, a break-through had not been possible. Both sides had gradually changed their objectives and now merely sought to prevent any movement of the opposing forces from that front to the decisive zone of operations between NIEUPORT and YPRES. Any weakness in the enemy's line, however, was utilised to gain new and improved positions from which another effort to break through might be made as soon as possible. Owing to the failure of the offensive south of NIEUPORT, a decision under the conditions existing there could not be hoped for; the German General Staff therefore began considering a plan for concentrating a strong new army of attack between the Fourth and the Sixth Armies behind the position occupied by the Army Cavalry, and for breaking through with it on the front WERWICQ-WARNETON, south of YPRES.