The town of Courtrai will be perceived to lie in the north-eastern angle of this inner oblong, the town of Lille rather below the middle of its western side. In all the country round Courtrai, and especially to the south of it, within the triangle X Y Z, lay the mass of Souham's command of 40,000 men. There were many posts, of course, scattered outside that triangle, and connecting Courtrai with Lille; but the links were weak, and the main force was where I have indicated it to be. A large body of French troops being encamped just under the walls of Lille at B (by which letter I mark Sainghin camp), and that fortress also possessing a garrison, the plan of cutting both these off from the 40,000 French that lay in the country near Courtrai involved getting the main part of the allies up from these points of departure on the south, and Clerfayt's body down from its point of departure on the north to meet upon the line drawn between Lille and Courtrai. Upon this line (which also roughly corresponds to the only main road between the two cities) may be perceived, lying nearer Lille than the centre of such line, the small town of Tourcoing and the village of Mouveaux. It was upon these two points that four of the five southern columns were to converge northward, the second and third column reaching them first, the fourth and fifth marching up from the left in aid; and it was also, of course, upon these two points that Clerfayt was to march southward from the post at Wervicq, that had been given _him_ as _his_ point of departure before dawn upon that Saturday morning. If everything went perfectly, the great mass of the allied army should have found itself, by noon of Saturday the 17th, as I have said, astraddle of the Lille-Courtrai road, and effectively cutting off the French troops to the north. What was the nature of the wide countryside over which these various movements were to take place? It was part of that great plain of Flanders which stretches from the River Scheldt almost unbroken to the Straits of Dover and the North Sea. In the whole of the great oblong represented by my sketch map there is hardly a point 150 feet above the water level of the main river valleys, while the great mass of that territory is diversified by no more than very broad and very shallow rolls of land, the crests of which are sometimes and exceptionally as much as fifty feet above the troughs, but the greater part thirty, twenty, or even less. Here and there an isolated hummock shows upon the landscape, but the general impression of one who walks across from the valley of the Lys to that of the Scheldt is of a flat, monotonous land in which one retains no memory of ascent or descent, and in which the eye but rarely perceives, and that only from specially chosen points, any wide horizon.