Russia Against Napoleon_ The True Story of the Campaigns of War and Peace - Dominic Lieven [228]
Bernadotte’s army on the other hand was deployed right in front of Berlin. He himself might wish to retreat towards his own Swedish bases on the Baltic coastline but if he abandoned Berlin without a struggle he would face revolt from his Prussian generals, whose troops constituted the biggest contingent in his army. Bernadotte knew this and therefore planned to beat off any French attack on Berlin. His nervousness was increased by his conviction that seizing the Prussian capital would be Napoleon’s first priority. He was actually not far wrong: Napoleon was obsessed by Berlin and directed two offensives against it, led by marshals Oudinot and Ney, in the first month of the war. Had the initial battles with the armies of Bohemia and Silesia gone successfully, Napoleon’s next move would have been to move northwards against Bernadotte with his Guards and the bulk of his other reserves.21
The armies of Silesia and Bohemia were in a safer position than Bernadotte so long as they stood on the defensive. If Napoleon was to be driven out of Germany they could not do this for long, however. Once they invaded Napoleon’s base in central Saxony they also would be vulnerable. In Schwarzenberg’s case his troops would have to cross the Erzgebirge, in other words the mountain range that ran along the whole length of the Saxon–Bohemian frontier. The only two decent roads from Bohemia across the Erzgebirge were the highways to Dresden and Leipzig. As they crossed the range these were 100 kilometres apart. If Schwarzenberg spread his advancing columns across both highways and the mountain paths between them, there was a chance that Napoleon would pounce on one of his flanks before the rest of the army could come to his aid. Rapid lateral movement across the steep valleys and along the winding mountain paths of the Erzgebirge was difficult even for messengers, let alone large bodies of troops. On the other hand, if Schwarzenberg tried to concentrate most of his army on just one highway, logistical problems would mount and his columns would move very slowly. That would increase the possibility of Napoleon pouncing on the leading divisions of the allied army while the rest of Schwarzenberg’s army was crawling forward in a long crocodile across the mountains.22
If Blücher’s army was to invade central Saxony it had to cross the Elbe. All the fortified crossings were in Napoleon’s hands, which meant that only he could move his troops across the river rapidly and in full security. The only way for Blücher to cross was by building pontoon bridges. For this he depended on his Russian pontoon companies, who did an outstanding job in getting the Army of Silesia across first the Elbe and later the Rhine. Their bridges were distinctly ramshackle affairs. A senior Russian staff officer in Blücher’s army recalled that ‘these bridges, which only lay a couple of feet above the surface of the water, had to be crossed with great care. They moved up and down all the time, horses had to be led, and any damage to the tarpaulin of one of the barges could immediately sink it.’ Once the army had crossed the river, either it dismantled the bridge and abandoned its communications or it had to construct field fortifications to protect the bridgeheads. The latter could never be as strong as permanent fortresses and therefore required much bigger garrisons. An army crossed such bridges much more slowly than over a permanent structure. It therefore had a higher chance of being caught by the enemy while moving across a river. The nightmare for any commander was to be forced to cross such a bridge in a hurry with Napoleon on his tail. True disaster loomed if the weather then turned against them, damaged the pontoons or made the bridge impossible to cross.23
Inevitably, to see things just from the allied perspective is to forget that Napoleon too faced serious problems. By standing on the defensive in Saxony with a large army