The position of Paris, on the north-eastern frontier, which was thus approached, is as strongly defensible, perhaps, as can be said of any unfortified town in the world. Art, however, had added little to the defence of the city itself, except a few wretched redoubts (called by the French _tambours_,) erected for protection of the barriers. But the external line was very strong, as will appear from the following sketch. The heights which environ the city on the eastern side, rise abruptly from an extensive plain, and form a steep and narrow ridge, which sinks again as suddenly upon the eastern quarter of the town, which it seems to screen as with a natural bulwark. The line of defence which they afford is extremely strong. The southern extremity of the ridge, which rests upon the wood of Vincennes, extending southward to the banks of the river Marne, is called the heights of Belleville and Romainville, taking its name from two delightful villages which occupy it, Belleville being nearest, and Romainville most distant from Paris. The heights are covered with romantic groves, and decorated by many pleasant villas, with gardens, orchards, vineyards, and plantations. These, which, in peaceful times, are a favourite resort of the gay Parisians, on their parties of pleasure, were now to be occupied by other guests, and for far different purposes. In advance of these heights, and protected by them, is the village of Pantin, situated on the great road from Bondy. To the left of Romainville, and more in front of Belleville, is a projecting eminence, termed the Butte de Saint Chaumont. The ridge there sinks, and admits a half-finished aqueduct, called the canal de l'Ourcq. The ground then again rises into the bold and steep eminence, called Montmartre, from being the supposed place of the martyrdom of St. Denis, the patron of France. From the declivity of this steep hill is a level plain, extending to the river Seine, through which runs the principal northern approach to Paris, from the town of Saint Denis. The most formidable preparations had been made for maintaining this strong line of defence, behind which the city lay sheltered. The extreme right of the French forces occupied the wood of Vincennes, and the village of Charenton upon the Marne, and was supported by the troops stationed on the heights of Belleville, Romainville, and on the Butte de Chaumont, which composed the right wing. Their centre occupied the line formed by the half-finished canal de l'Ourcq, was defended by the village of La Villette, and a strong redoubt on the farm of Rouvroi, mounted with eighteen heavy guns, and by the embankments of the canal, and still farther protected by a powerful artillery planted in the rear, on the heights of Montmartre. The left wing was thrown back from the village called Monceaux, near the north-western extremity of the heights, and prolonged itself to that of Neuilly, on the Seine, which was strongly occupied by the extreme left of their army.