In the summer of 1810, the thirty-nine-year-old Gaspard Lefebvre found himself tasked with the most audacious military operation of the era: the invasion of Russia. Unlike the fractured realms conquered by the Mongols or the Polish-Swedish Union in centuries past, Russia was at the absolute height of its power, boasting a robust economy and a highly capable army under Tsar Konstantin I Stenkil. While Gaspard recognized the peril of invading such a formidable, unified state, he fatalistically obeyed the Council's directives, ignoring the desperate pleas of his lover, Elsie Dupont, to abandon the campaign. Within the French high command, two competing strategies emerged. Gaspard intended to force a single, decisive battle to destroy the Russian army and quickly negotiate a normalized peace, whereas General Etienne Breard advocated for a campaign of utter devastation across western Russia to terrorize the Tsar into submission. The Council funded both approaches equally, deploying a massive 380,000-man invasion force on June 30th. Gaspard led the 205,000-strong "Army of the Republic," while Breard commanded the 175,000-strong "Army of the East."

As the invasion commenced, the two armies experienced vastly different campaigns. Breard’s lighter force advanced rapidly through Livonia, ruthlessly executing his strategy of devastation by massacring civilians and razing towns like Velikiye Luki to the ground against minimal Russian resistance. Gaspard’s heavier army, meanwhile, faced unexpectedly fierce opposition at Riga, requiring a brutal three-day siege to pacify the city. As Gaspard pushed deeper into the Baltic territories toward Wolmar and Dorpat, his forces were continuously harassed by elusive Russian Cossacks, who launched a particularly devastating raid that captured 1,200 men from the trailing Württemberg Corps. Desperate to maintain momentum and avoid a grinding siege at the heavily fortified city of Pskov, Gaspard utilized strategic misinformation to trick the Russians into anticipating a northern thrust toward Nevagrad. This deception allowed him to successfully execute a massive, unopposed amphibious flanking maneuver across the narrowest point of Lake Peipus.

Despite this tactical success, the French military apparatus began to disintegrate from within as it trudged through the harsh, swampy environment. Relentless summer rains, inadequate foraging, and a total breakdown of supply lines bred rampant starvation, desertion, and deadly outbreaks of dysentery and typhus. By the time the army reached an abandoned Pskov in late August, the soldiers had been driven mad by disease, hunger, and the psychological terror of the invisible Cossack threat. Discipline collapsed entirely as Polish, Württemberger, and French troops initiated a horrific sack of the city, establishing ad-hoc tribunals to execute civilians and setting entire neighborhoods ablaze. Gaspard, recognizing that his men had slipped beyond his control, passively retreated to his tent and allowed the atrocities to burn themselves out, feeling profoundly isolated in the hostile eastern landscape.

The campaign culminated in October as the French approached Soltsy, the final fortified bulwark protecting the Russian capital of Novgorod. Tsar Konstantin had ordered General Orlovsky to hold the city to the last man, resulting in 145,000 entrenched Russian troops facing Gaspard’s disease-depleted force of 125,000. On October 6th, the Battle of Soltsy began with punishing Russian artillery barrages and cavalry skirmishes that paralyzed the French center, which was held by the already demoralized Württemberg Corps. In the early afternoon, Russian General Kireev ordered a massive infantry advance. The battered Württembergers completely routed under the pressure, fleeing in absolute chaos. However, this collapse inadvertently sprang a catastrophic trap; as the Russian infantry surged forward in pursuit, they ran point-blank into a masked battery of 300 French cannons loaded with canister shot.

The resulting French artillery barrage instantly annihilated the Russian center, tearing thousands of men to pieces in mere minutes. General Dubois immediately capitalized on the carnage, leading the Cavalry Guard in a devastating charge that shattered the remaining, disorganized Russian flanks. By sundown, General Orlovsky was forced to retreat and burn Soltsy, leaving behind 53,000 Russian casualties in what became the bloodiest battle in European history. Yet, when Gaspard marched into Novgorod days later, he found a burning, lawless city abandoned by the Tsar and his court. The victory at Soltsy proved entirely hollow; with his army stranded deep in hostile territory, his Württemberg allies sacrificed, and the Tsar refusing to surrender, Gaspard's grand strategy of a rapid, negotiated peace had completely failed, exposing the invasion of Russia as a monumental strategic disaster.