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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. 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 armament of the Lille fortress zone in 1914 consisted of 446 guns and 79,788 shells (including 3,000 × 75 mm), 9,000,000 rounds of rifle ammunition and 12 × 47 mm guns from Paris. During the Battle of Charleroi (21 August), General d'Amade garrisoned the area from Maubeuge to Dunkirk with a line of Territorial divisions. The 82nd Division held the area between the Escaut and the Scarpe, with advance posts at Lille, Deûlémont and Tournai, just over the Belgian border. The Territorials dug in but on 23 August, the BEF retreated from Mons and the Germans drove the 82nd Territorial Division out of Tournai. The German advance reached Roubaix and Tourcoing before a counter-attack by the 83rd and 84th regiments, that reoccupied Tournai during the night. Early on 24 August, the 170th Brigade organised the defence of the bridges over the Escaut but around noon, the Territorials were forced back by a German attack. The Mayor of Lille requested that Lille be declared an open city and at 5:00 p.m., the Minister of War ordered the garrison to leave the city and move between La Bassée and Aire-sur-la-Lys.
On 25 August, the German 1st Army reached the outskirts of Lille and General Herment withdrew the garrison. Maubeuge to the south was defended by 45,000 men and the Belgian army was still defending Antwerp to the north. On 2 September, German detachments entered Lille and left three days later; the town was intermittently occupied by patrols guarding the right flank of the 1st Army. After the German retreat from the Marne and the First Battle of the Aisne (13 September – 28 September), the northward manoeuvre known as the Race for the Sea commenced and on 3 October, Joffre formed the Tenth Army ( General de Maud'huy), to reinforce the northern flank of the French armies. When the XXI Corps arrived from Champagne, the 13th Division de-trained to the west of Lille. On the morning of 4 October, Chasseur battalions of the 13th Division moved to positions north and east of Lille.