For a fortnight the British were on the road and out of the fight, which was left for the most part to Castelnau's 7th and Maud'huy's 10th Armies; and strenuous fighting it was for all-important objects. There was little profit in a British out-march round the German flank in Flanders unless the links between it and the Oise could be maintained, and the Germans were as speedily reinforcing and extending their right as we were preparing to turn it. At first Castelnau seemed to be making rapid and substantial progress; he captured Noyon on 21 September, was pushing on by Lassigny to Roye, and optimistic maps in the English press depicted the German right being bent back to St. Quentin and the French outflanking it as far north-east as Le Catelet. These were not intelligent anticipations. Von Kluck had been reinforced, and a desperate battle ensued from the 25th to the 28th, in which Castelnau was driven back from Noyon and Lassigny. This counter-attack was repulsed with great losses at Quesnoy and Lihons a little farther north, but Maud'huy was not less heavily engaged north of the Somme in a several days' struggle for the Albert plateau. The line established was supposed to run through Combles and Bapaume, and it was not till long afterwards that the public realized how far it had sagged to the westwards, or what that sagging meant when the British had to fight their way up to Bapaume. North of that watershed the fronts were fluid, if the scattered bodies of French Territorials and German cavalry could be said to constitute a front at all; and there was a strenuous race and struggle to turn the respective flanks. Neither side, it was soon apparent, would succeed in that object, and the practical question was at what point the outflanking contest would reach the coast. The German ambition was to push their right as far south as the mouth of the Seine, while the Allies hoped to thrust their left to the north until it joined the Belgian Army at Antwerp. Maud'huy had entered Arras on 30 September, and some of his Territorials pushed forward to Lille and Douai. During the first three days of October he was fighting hard on the eastern slopes of Vimy Ridge but was compelled to fall back on Arras, while the Germans occupied Lille and Douai and their cavalry penetrated as far as Bailleul, Hazebrouck, and Cassel. But the British from the Aisne were moving up towards their positions on Maud'huy's left, the Aire-La Bassée Canal being fixed as the point of their junction, and the 7th Division, with a division of cavalry, had landed at Ostend and Zeebrugge while the Naval Division was sent to assist in the defence of Antwerp. The Allied dream of a front along the Scheldt to Antwerp, barring German access to the sea, seemed on the verge of realization; but dramatic as the moment was, the tension would have been far more acute had men grasped what a difference possession of the Belgian coast was to make in the course of the war.