Tormasov’s regiments contained fewer veterans than Chichagov’s but they had gained experience in 1812 while suffering far fewer casualties than the armies of Bagration and Barclay. There were no new recruits, let alone militia, in either army by September 1812. On 29 September Aleksandr Chernyshev arrived at their headquarters with orders for Chichagov to take over command of both armies and for Tormasov to join Kutuzov. He also brought Alexander’s plan, which required Chichagov to push the Austrian and Saxon corps westwards into the Duchy of Warsaw and himself then advance to Minsk and the river Berezina in order to block Napoleon’s retreat.
After uniting with Tormasov, Chichagov initially had 60,000 men available for the campaign, though if Alexander’s plan was properly executed he would be joined in Belorussia by General Oertel’s 15,000 troops, currently in Mozyr, and by 3,500 men under Major-General Lüders, who had fought the Ottomans in Serbia during the recent war. When Chichagov advanced in late September, the Austrian and Saxon corps retreated westwards into the Duchy of Warsaw. With his headquarters in Brest, Chichagov then spent two weeks gathering supplies for his advance towards Minsk and the Berezina. Since he would be marching 500 kilometres into a devastated war zone this made good sense, though his delay caused some grumbling. But the delay meant that Chichagov could only arrive on the Berezina just before Napoleon. He would have no time to get to know the unfamiliar terrain he was supposed to defend. It would not be possible to carry out Alexander’s instructions to fortify the key choke-points and defiles through which Napoleon’s army might pass.
In the last week of October Chichagov set off for Belorussia, leaving almost half his army – 27,000 men under Fabian von der Osten-Sacken – to hold off Schwarzenberg and Reynier. Since together the Austrians and Saxons numbered 38,000 men and were expecting reinforcements this was to ask a great deal of Sacken. In fact, however, the Russian general fulfilled his mission to perfection, though he complained – in this case correctly – that his army’s achievements were forgotten since he could not hope for brilliant victories against so superior an enemy and in any case all Russian eyes were turned on the fate of Napoleon and his army.
When Schwarzenberg set off in pursuit of Chichagov in accordance with Napoleon’s instructions, Sacken’s surprise attack on Reynier’s Saxons forced him to turn back to their rescue. Subsequently, Sacken succeeded in slipping away from Schwarzenberg’s attempts to catch him, and in pinning down the Austrian and Saxon corps for the rest of the campaign. Sacken preserved his own little army amidst a flurry of manoeuvres and rearguard actions, and it provided some of the best and freshest regiments for the 1813 campaign. Above all, by drawing both Schwarzenberg and Reynier well away from Minsk and the Berezina he made it possible for Chichagov to advance into central Belorussia and threaten the survival of Napoleon and his army.58
Chichagov moved swiftly. His advance guard was commanded by yet another French émigré, Count Charles de Lambert, who had joined the Russian army in 1793. Lambert’s force comprised some 8,000 men, mostly cavalry, its four jaeger regiments being commanded by Prince Vasili Viazemsky, whose diary as we have seen breathed such distrust for the foreigners and parvenus who were wrecking Russia. The main uncertainty for the Russian commanders was the whereabouts of Marshal Victor’s corps. Vasili Viazemsky, one of nature’s pessimists, was convinced that the Russian advance could not succeed since the enemy had at least as many men in central Belorussia as Chichagov. In fact Napoleon had ordered Victor to send one of his divisions to reinforce the garrison of Minsk but by the time the order arrived Victor’s whole corps had already moved northwards to stop Wittgenstein. With Victor deflected northwards and the Austrians and Saxons far off to the west, the defence of the southern approaches to Belorussia was left to General Jan Dombrowski and no more than 6,000 combat-worthy soldiers.