In russian, word 'army' means armed forces in general. While the land branch of armed forces is called: "Suhoputniye sily" (Сухопутные силы) which can be translated as Land Forces or Ground Forces.
The commanders of Peter's army were initially drawn from the old nobility (dvoriane), which had been expected to serve as the officer caste as well as to staff the ranks of the newly created civil administrations.
The r point is this: the Russianarmy had to rely on a strategy of retreat and scorched earth despite all the political and economic liabilities of such a strategy.
The Russian transportation system was very weak and the methods of supply heartbreakingly slow, this in a country that had undertaken the invasion of East Prussia as its first act in the war.
The only difference was that the Russianarmy moved at its own will, free from the menace of annihilation that hung over the French, and that the sick and stragglers of the French were left in the hands of their enemy, while Russian stragglers were at home among their own people.
The chief cause of the wasting of Napoleons army was the rapidity of its movements, and an indubitable proof of that is to be seen in the corresponding dwindling of the Russianarmy.
The object of the Russianarmy was the pursuit of the French.