The position was now such that the attack could immediately be directed on the citadel, and on it the batteries in the Bois des Perches and presently those in the second parallel opened fire. Moitte, Justice, and Bellevue were shelled simultaneously. General von Debschitz had returned, so that the investing corps was thus again brought up to its full strength, and all the conditions were improved by the return of the frost. By the 13th ninety-seven guns were ready in the third parallel.
The town had suffered terribly from the prolonged bombardment. Nearly all the buildings were damaged, fifteen completely burnt down, and in the adjoining villages 164 houses had been destroyed by the defenders themselves. The fortifications showed not less visible indications of serious damage, particularly the citadel. The hewn-stone facing of its front-wall had crumbled into the ditch. Half of the mantleted embrasures had been shattered, the expense powder magazines had been blown up, and a number of casemated traverses pierced. The guns in the upper batteries could only be reached by ladders. The garrison, of its original strength of 372 officers and 17,322 men, had lost 32 officers and 4713 men, besides 336 citizens. The place was no longer tenable; besides there now came the news that the army from which alone relief was to be expected, had laid down its arms.
Under these circumstances General von Tresckow summoned the commandant after a defence so brave to surrender the fortress, with free withdrawal for the garrison, this concession having the sanction of his Majesty. The French Government itself authorized the commandant to accept these terms. Colonel Denfert, however, insisted that he must be given a more direct order. To procure this an officer was sent to Basle, pending whose return there was a provisional armistice.
On the 15th a convention was signed at Versailles, which extended the armistice to the three departments which till then had been excluded from it, and also to Belfort; but the 1st article demanded the surrender of that place.
After the conclusion of the definitive treaty, the garrison, in the course of the 17th and 18th, with its arms and trains, left the precincts of the fortress and withdrew by way of L'Isle sur Doubs and St. Hippolyte into the country occupied by French troops. The march was effected in detachments of 1000 men at intervals of 5 km., the last of which Colonel Denfert accompanied. The supplies which remained in the fortress were conveyed in rear of the departing troops in 150 Prussian proviant waggons. At 3 o'clock in the afternoon of February 18th Lieutenant-General von Tresckow entered the place at the head of detachments from all the troops of the investing corps.
There were found 341 guns, of which 56 were useless, 356 gun-carriages, of which 119 were shot to pieces, and 22,000 stand of arms, besides considerable supplies of ammunition and provisions.
The siege had cost the Germans 88 officers and 2049 men, 245 of whom were released from imprisonment by the capitulation. Immediately was set about the work of restoring and arming the fortress, and of the levelling of the siege works.
The Armistice.
On the basis of the agreement of January 28th a line of demarcation was drawn, from which both parties were to withdraw their outposts to a distance of 10 km. The line ran south from the mouth of the Seine as far as the Sarthe, crossed the Loire at Saumur, followed the Creuse, turned eastward past Vierzon, Clamécy and Chagny, and then met the Swiss frontier, after bending to the north of Châlons sur Saône and south of Lons le Saulnier and St. Laurent. The two departments of Pas de Calais and du Nord, as well as the promontory of Havre, were particularly excluded.