The tactics of Napoleon had, by long practice, been pretty well understood, by those studious of military affairs. Barclay de Tolly, whom Alexander had made his generalissimo, a German by birth, a Scotchman by extraction, had laid down and recommended to the Czar, with whom he was in great favour, a plan of foiling Buonaparte upon his own system. He proposed that the Russians should first show only so much opposition on the frontier of their country, as should lay the invaders under the necessity of marching with precaution and leisure; that they should omit no means of annoying their communications, and disturbing the base on which they rested, but should carefully avoid every thing approaching to a general action.[113] On this principle it was proposed to fall back before the invaders, refusing to engage in any other action than skirmishes, and those upon advantage, until the French lines of communication, extended to an immeasurable length, should become liable to be cut off even by the insurgent peasantry. In the meanwhile, as the French became straitened in provisions, and deprived of recruits and supplies, the Russians were to be reinforcing their army, and at the same time refreshing it. Thus, it was the object of this plan of the campaign not to fight the French forces, until the bad roads, want of provisions, toilsome marches, diseases, and loss in skirmishes, should have deprived the invading army of all its original advantages of numbers, spirit, and discipline. This procrastinating system of tactics suited Russia the better, that her preparations for defensive war were very far from being completed, and that it was important to gain time to receive arms and other supplies from England, as well as, by making peace with the Turks, to obtain the disposal of the large army now engaged upon the Danube. At the same time it was easy to foresee, that so long a retreat, together with the desolation occasioned to the Russian territory by the presence of an invading army, might wear out the patience of the Russian soldiery. Some advantageous position was therefore to be selected, and skilfully fortified before hand, in which a stand might be made, like that of Lord Wellington in the lines at Torres Vedras. For this purpose, a very large fortified camp was prepared at Drissa, on the river Düna, or Dwina, which, supposing the object of the French to have been St. Petersburgh, would have been well calculated to cover that capital. On the other hand, were the French to move on Moscow, which proved their final determination, the intrenchments at Drissa were of no importance. We must speak of the immense hosts combined under Buonaparte, as if they were all constituent parts of one army, although the theatre of war which they occupied was not less than an hundred and twenty French leagues in extent of front.