Throughout the last months of the eventful year 1870, the northern part of France, from the Jura to the Channel, from the Belgian frontier to the Loire, presented the aspect of a wide battlefield. Of the troops that had been set free by the capitulation of Metz, a part remained behind in garrison, another division marched northwards in order to invest the provinces of Picardy and Normandy, to restore communication with the sea, and to bar the road to Paris, and a third division joined the second army, whose commander-in-chief, Prince Frederick Charles, set up his headquarters at Troyes. Different detachments were despatched against the northern fortresses, and by degrees Soissons, Verdun, Thionville, Ham, where Napoleon had once been a prisoner, Pfalzburg and Montmedy, all fell into the hands of the Prussians, thus opening to them a free road for the supplies of provisions. The garrison troops were all carried off as prisoners to Germany; the towns--most of them in a miserable condition--fell into the enemy's hands; many houses were mere heaps of ruins and ashes, and the larger part of the inhabitants were suffering severely from poverty, hunger and disease. [=Guerilla Warfare in the East=] The greatest obstacles were encountered in the northern part of Alsace and the mountainous districts of the Vosges and the Jura, where irregular warfare, under Garibaldi and other leaders, developed to a dangerous extent, while the fortress of Langres afforded a safe retreat to the guerilla bands. Lyons and the neighboring town of St. Etienne became hotbeds of excitement, the red flag being raised and a despotism of terror and violence established. Although many divergent elements made up this army of the east, all were united in hatred of the Germans and the desire to drive the enemy back across the Rhine. Thus, during the cold days of November and December, when General Von Treskow began the siege of the important fortress of Belfort, there burst forth a war around Gray and Dijon marked by the greatest hardships, perils and privations to the invaders. Here the Germans had to contend with an enemy much superior in number, and to defend themselves against continuous firing from houses, cellars, woods and thickets, while the impoverished soil yielded a miserable subsistence, and the broken railroads cut off freedom of communication and of reinforcement. [=In the Jura District=]