On the other hand, there was a direct line of railway running through Rheims, Rethel, Mezières to the great war depot, Coblenz on the Rhine. A branch line from Metz, through Luxemburg, thus gave communication to the eastern wing. All the links of this were in German hands, except Rheims, and if that railroad center could be secured, the importance to the German advance would be enormous. Under such circumstances, it can scarcely be held that Rheims was not necessarily a point, the attack of which was due to military necessity.
The formation for this began on September 17, 1914. Crossing the Aisne by the old ford of Berry-au-Bac, a powerful army under the direct leadership of Field Marshal von Heeringen debouched upon the open country between Berry-au-Bac and Suippes, east of Rheims. It was at this point that the German commander in chief of this section of the battle line intended to deliver a crushing blow by which might be regained the prestige secured at Charleroi and lost again at the Marne.
Surprise may be felt that so important a railway center as Rheims should not have been a strongly fortified place. It had been so once, though the fortifications were old-fashioned. But, instead of bringing these points of natural defense up to the highest degree of modern efficiency, the French had dismantled them entirely, so as to make Rheims with its glorious cathedral an open town, safe from bombardment. It was, according to the rules of war, safe from bombardment, but only in the event of its not being defended. General Foch did not dare to take this stand. He knew, as well as did General von Heeringen, the strategic value of Rheims as railroad center, and accepted the issue of battle.
In the falling back of the several German armies from the Marne to the Aisne, the Germans had kept possession of the chief forts of the district around Rheims. No strong effort had been made to dislodge them, for the forward movement of the Allies had been directed against the fortified heights of the Aisne, facing the Soissons-Craonne defense. It will be remembered that the armies of General Foch and Langle, especially the latter, had taken no part in the first phase of the Battle of the Aisne, but had stubbornly thrown back the armies of the Duke of Württemberg, which had combined with those of the crown prince. The right wing of this large conjoined army had held the fort sites around Rheims and especially they had made full use of the chief fort on the wooded heights of Nogent l'Abbesse, a trifle less than half a mile from the cathedral city and therefore within easy destructive shelling range. The heavy artillery was planted here, the infantry intrenched around it, and strong defense trenches were established along the River Suippe that runs into the Aisne near Berry-au-Bac.