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To the south-east, canals run between Lens, Lille, Roubaix and Courtrai, the Lys river from Courtrai to Ghent and to the north-west lay the sea. The plain is almost flat, apart from a line of low hills from Cassel, east to Mont des Cats, Mont Noir, Mont Rouge, Scherpenberg and Mount Kemmel. From Kemmel, a low ridge lies to the north-east, declining in elevation past Ypres through Wytschaete, Gheluvelt and Passchendaele, curving north then north-west to Dixmude where it merged with the plain. A coastal strip about 10 mi (16 km) wide, was near sea level and fringed by sand dunes. Inland the ground was mainly meadow, cut by canals, dykes, drainage ditches and roads built up on causeways. The Lys, Yser and upper Scheldt had been canalised and between them the water level underground was close to the surface, rose further in the autumn and filled any dip, the sides of which then collapsed. The ground surface quickly turned to a consistency of cream cheese and on the coast troops were confined to roads, except during frosts.
The rest of the Flanders Plain was woods and small fields, divided by hedgerows planted with trees and cultivated from small villages and farms. The terrain was difficult for infantry operations because of the lack of observation, impossible for mounted action because of the many obstructions and difficult for artillery because of the limited view. South of La Bassée Canal around Lens and Béthune was a coal-mining district full of slag heaps, pit-heads (fosses) and miners' houses (corons). North of the canal, the city of Lille, Tourcoing and Roubaix formed a manufacturing complex, with outlying industries at Armentières, Comines, Halluin and Menin, along the Lys river, with isolated sugar beet and alcohol refineries and a steel works near Aire-sur-la-Lys. Intervening areas were agricultural, with wide roads on shallow foundations and unpaved mud tracks in France and narrow pavé roads along the frontier and in Belgium. In France, the roads were closed by the local authorities during thaws, to preserve the surface and marked by Barrières fermées, which were ignored by British lorry drivers. The difficulty of movement in the autumn absorbed much of the labour available on road maintenance, leaving field defences to be built by front-line soldiers.On 11 October, the British III Corps (Lieutenant-General William Pulteney), comprising the 4th and 6th divisions, arrived by rail at St Omer and Hazebrouck and then advanced behind the left flank of II Corps, towards Bailleul and Armentières. II Corps was to advance around the north of Lille and III Corps was to reach a line from Armentières to Wytschaete, with the Cavalry Corps on the left as far north as Ypres.
