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Logistics

The invasion of Russia starkly highlights the pivotal role of logistics in military strategy, particularly in situations where the available terrain cannot sustain the large number of deployed troops. Napoleon meticulously prepared for supplying his army, significantly surpassing the logistical efforts of previous campaigns. To sustain the Grande Armée and its operations, twenty train battalions with 7,848 vehicles, were mobilized to provide a 40-day supply. Extensive magazines were strategically set up in towns and cities across Poland and East Prussia, while the Vistula river valley was developed into a vital supply base in 1811–1812. Intendant / Quartermaster General Dumas organized five supply lines from the Rhine to the Vistula, establishing administrative headquarters in three arrondissements in French-controlled Germany and Poland. This logistical preparation served as a significant trial of Napoleon's administrative and logistical acumen, with his focus in the first half of 1812 dedicated mainly to provisioning his invading army.

Napoleon's study of Russian geography and history, including Charles XII's invasion of 1708–1709, reinforced his understanding of the imperative to transport as many supplies as possible. The French Army's prior experience operating in the sparsely populated and underdeveloped regions of Poland and East Prussia during the War of the Fourth Coalition (1806–1807) also informed their approach.

However, nothing was to go as planned, because Napoleon had failed to take into account conditions that were totally different from what he had known so far.

Napoleon and the Grande Armée were accustomed to utilizing the method of living off the land, which proved successful in the densely populated and agriculturally prosperous regions of central Europe, characterized by a well-connected network of roads. Swift forced marches had disoriented the traditional Austrian and Prussian armies, relying extensively on foraging for sustenance. Colonel Pion documented the logistical challenges that this strategy imposed on the army:

There is no fodder for the horses; as usual there is no order or administration; the Army must live by the sword, and even on Prussian territory and with their allies, the troops pillage atrociously, as if they were in an enemy’s country.

During the campaign, the widespread death and depletion of horses emerged as a significant issue. Forced marches often forced troops to go without essential supplies, as supply wagons struggled to keep pace; The scarcity of roads, frequently turned to mud by rainstorms (rasputitsa), further impeded horse-drawn wagons and artillery.

In thinly populated and agriculturally sparse regions, the lack of food and water led to casualties among troops and their mounts, exposing them to waterborne diseases from drinking contaminated water and consuming spoiled food and forage. While the foremost sections of the army received whatever provisions could be supplied, formations behind them suffered from starvation. During the attack phase, Vilna stood as the most advanced magazine in the operational area. Beyond that point, the army had to rely solely on its own resources.