The initiative lay in the hands of the allies. No invasion of Saxony was possible, however, unless the Army of Bohemia advanced back across the Erzgebirge. Schwarzenberg was not yet willing to try this again. In part he needed time to receive and train the Austrian troops who were to fill the gaps left by the battle of Dresden. During the chaotic retreat through the mountains in late August many carts and more supplies and ammunition had been lost. These too needed to be replaced before there could be any thought of a further offensive. Many horses had lost their shoes amidst the mud and stones of the mountain roads and, above all, during the steep descent into the Teplitz valley. In September 1813 horseshoes were in very short supply in Bohemia and had to be shipped in from elsewhere.
In general, supplying the allied armies in northern Bohemia was difficult and resulted in many disagreements between the Austrian, Russian and Prussian troops. The Austrians accused the Russians of marauding. The Russians replied that their troops were forced to hunt for food because the Austrians were failing to feed them, as they were obliged to do by the agreement between the two governments which covered the upkeep of the Russian troops while they were stationed on Austrian territory. Kankrin subsequently stated that there was in principle nothing wrong with the Austro-Russian agreement: the only, and far more costly, alternative would have been to use private contractors. But the Austrians had failed to implement the terms of the agreement efficiently. Ultimately, one partial solution to problems of supply was to move much of the cavalry towards central Bohemia where forage was abundant, until the allies were ready to resume the offensive.1
Strategic considerations also delayed allied operations. The near-disaster in late August had confirmed existing Austrians fears about the perils of advancing down the roads through the Erzgebirge. It had also provided ample justification for their concern that Napoleon would use their advance into the Erzgebirge to strike into their right and rear in Bohemia. Schwarzenberg would not move forward again into Saxony unless he was confident that he was well protected against any such threat. The problem was set out rather well in a memorandum by Jomini of 3 September. The main army needed to invade Saxony with at least 170,000 men, of whom 20,000 must be left to watch Dresden. It could not simultaneously detach sufficient troops to guard the line of the Elbe south of Dresden against the kind of strike contemplated by Napoleon and actually attempted by Vandamme in August. Jomini’s solution was the one favoured by Schwarzenberg and agreed by the monarchs: Blücher’s army must march into Bohemia to protect the right flank of the main army as it advanced across the Erzgebirge. Should no threat materialize from Napoleon, the Army of Silesia could then itself join the invasion of Saxony by marching up the Teplitz highway to Dresden and beyond.2
The victory of Dennewitz and the arrival of reinforcements for the Army of Bohemia changed some of Jomini’s numbers without altering the basic strategic issue. Not at all surprisingly, Blücher was deeply unwilling to lose his independence and become a mere adjunct of Schwarzenberg’s lumbering army. He wrote to Knesebeck as follows: for the ‘sake of the common good, preserve me from a union with the main army; what can such a vast mass of men achieve in terrain of that sort?’ Another letter from Blücher, drafted by Gneisenau and dated 11 September, went directly to Alexander and stressed the impact on Bernadotte if Blücher moved away from him and towards Bohemia: ‘The battle of 6 September [i.e. Dennewitz] has certainly changed the military position within the theatre but the crown prince of Sweden would probably straight away and with good reason fall into inactivity if he noticed that the Army of Silesia was moving a long way away from him.’3
Caution was required when writing on such delicate themes. Along with the letter, Blücher also sent his excellent staff officer, Major Rühle von Lilienberg, to pass on his views orally to Alexander and Frederick William. Rühle stressed Blücher and Gneisenau’s opinion that ‘so long as the crown prince is deployed on his own in a separate theatre of war we can expect no activity from him because of his political position’. The combination of written and oral urgings convinced the monarchs and had a decisive influence on the future of the campaign. Blücher was allowed to remain independent and to plan his crossing of the Elbe and link-up with Bernadotte. Nesselrode wrote to Pozzo to keep the crown prince in line during the forthcoming military operation. Meanwhile Bennigsen’s Army of Poland would be diverted from its march across Silesia and would instead be brought southwards to Bohemia to guard Schwarzenberg’s right and rear.4