The works constructed under Louis Philippe effectually protected the city from being taken by storm. The artillery armament of the place consisted of over 2627 pieces, including 200 of the largest calibres of naval ordnance. There were 500 rounds for each gun, and in addition a reserve of three million kilogrammes of powder. As concerned the active strength of the garrison, besides the XIIIth Corps which had returned from Mézières, a new Corps, the XIVth, had been raised in Paris itself. These 50,000 troops of the line, 14,000 highly efficient and staunch marines and sailors, and about 8000 gensd'armes, customs officers, and forest-guards, formed the core of the defence. There were besides 115,000 Gardes-Mobiles, who had been drawn in from outside at an earlier date. The National Guard was formed into 130 battalions, which, however, being defective in equipment and poorly disciplined, could be employed only in the defence of the inner circle of fortifications. The volunteers, though numerous, proved for the most part useless.
In all the besieged force was over 300,000 strong, thus it was far more than double the strength of the besiegers as yet on the spot, of whom there were at the outside only about 60,000 men available, with 5000 cavalry and 124 field-batteries. On the Seine the defence had five floating batteries and nine section-built gunboats originally intended for the Rhine; on the railways were some guns mounted on armour-plated trucks.
Great difficulties necessarily attended the victualling of two million human beings for a long period; however, the authorities had succeeded in gathering into Paris 3000 oxen, 6000 swine, and 180,000 sheep, with considerable stores of other provisions, so that perfect confidence was justifiable, that Paris could hold out for six weeks at least.
Orders issued from the head-quarter at Meaux charged the Army of the Meuse with the investment of the capital on the right bank of the Seine and Marne,[31] and the IIIrd Army with the section on the left bank of both rivers. As a general rule the troops were to remain beyond range of the fire of the fortress, but, short of that, were to keep as close as possible so as to curtail the circuit of environment. The close connection of the two armies was to be secured above Paris by several bridges across both the rivers, and below the city, by the cavalry occupying Poissy. To the IIIrd Army was to belong the duty of reconnoitring in the direction of Orleans. In case of any attempt to relieve the capital it was to allow the relieving force to approach within a short distance, and then, leaving the investment to be maintained by weak details, to strike the enemy with its main body.
Without relief from outside, a close passive blockade must inevitably result in the capitulation of Paris, though probably not for some weeks or even months. As an ultimate compulsory measure there remained recourse to a bombardment.
At the time when Paris was fortified it was not foreseen that improvements in the artillery arm would double or treble the range of fire. The exterior forts, especially on the south, were at so short a distance from the enceinte that the city could easily be reached by the fire of heavy batteries.
The Germans have been blamed for not having had recourse at an earlier date to this expedient of bombardment; but this criticism indicates an inadequate appreciation of the difficulties which stood in the way of its earlier execution.
It may safely be accepted that the attack of a large fortified place in the heart of an enemy's country is simply impossible so long as the invader is not master of the railways or waterways leading to it, by which may be brought up in full quantity the requisite material. The conveyance of this by the ordinary highways, even for a short distance, is in itself a herculean undertaking. Up to this time the German army had the control of only one railway in French territory, and this was fully occupied in the maintenance of supplies for the armies in the field: in bringing up reinforcements and equipment; in conveying rearward wounded, sick and prisoners. But even this much of railway service ended at Toul; and the attempt to turn that fortress by laying a temporary section of line found insurmountable difficulties in the nature of the ground. Further forward there interposed itself a scarcely inferior obstacle in the complete destruction of the Nanteuil tunnel, to repair which would probably require weeks.
Even then, for the further transport from Nanteuil up to the Paris front of 300 heavy guns with 500 rounds for each gun, there were requisite 4500 four-wheeled waggons, such as were not in use in the country, and 10,000 horses. Thus a bombardment was, in the earlier period, not to be thought of, and in any case the object of it would not be to destroy Paris, but merely to exert a final pressure on the inhabitants; and this influence would be more effectual when a long blockade had shaken the resolution of the besieged than it was likely to be at the beginning of the investment.
September 18th.—Corresponding directions communicated to the respective army commands, ordered the resumption of the march on the enemy's capital.