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On 24 September, the French advance met a German attack rather than an open flank and by 29 September, having been reinforced to eight corps, the Second Army was still being opposed by German forces near Lille, rather than advancing around an open German northern (right) flank. The 6th Army had also found that on arrival in the north, it was forced to oppose the French, rather than advance around their northern (left) flank and that the secondary objective of protecting the northern flank of the German armies in France had become the main task. By 6 October the French needed British reinforcements to withstand German attacks around Lille. The British Expeditionary Force (BEF) had begun to move from the Aisne to Flanders on 5 October and reinforcements from England assembled on the left flank of the Tenth Army, which had been formed from the left flank units of the Second Army on 4 October. The Allies and the Germans, attempted to take more ground after the "open" northern flank had disappeared, the Franco-British attacks towards Lille in October, being followed up by attempts to advance between the BEF and the Belgian army by a new French Eighth Army. The moves of the 7th and then the 6th Army from Alsace and Lorraine had been intended to secure German lines of communication through Belgium, where the Belgian army had sortied several times during the period between the Franco-British retreat and the Battle of the Marne. In August British marines had landed at Dunkirk and in October a new 4th Army was assembled from the III Reserve Corps and the siege artillery used against Antwerp and four of the new reserve corps training in Germany. The North-east of France and the south-west Belgium were known as Flanders. West of a line between Arras and Calais in the north-west, lay chalk downlands, covered with soil sufficient for arable farming. East of the line, the land declines in a series of spurs into the Flanders plain, bounded by canals linking Douai, Béthune, St. Omer and Calais. To the south-east, canals ran between Lens, Lille, Roubaix and Courtrai, the Lys river from Courtrai to Ghent and to the north-west lay the sea. The plain was almost flat, apart from a line of low hills from Cassel, east to Mont des Cats, Mont Noir, Mont Rouge, Scherpenberg and Mont Kemmel.From Kemmel, a low ridge lay to the north-east, declining in elevation past Ypres, through Wytschaete, Gheluvelt and Passchendaele, curving north and then north-west to Dixmude, where it merged with the plain.
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