The last major battle had been the
Battle of Tarutino on 18 October 1812, that was won by the Russian army. A great part of the large mob of non-combatants, invalids from the hospitals, women, fugitive inhabitants of Moscow, whose number can only be guessed at, was directed upon
Vereya and the straight road to Smolensk and only the fighting force was to march towards Kaluga. On 19 October 1812, Napoleon had retreated from Moscow and marched south-west to
Kaluga,
Eugène de Beauharnais leading the advance. The French army leaving Moscow was estimated by
Wilson: 90,000 effective
infantry, 14,000 feeble
cavalry, 12,000 armed men employed in the various services of
artillery,
engineers, gendarmerie, head-quarter staff, equipages, and commissariat, and more than 20,000 non-combatants, sick, and wounded. General Dorokhov's
partisan detachment was the first to discover Napoleon's movement towards
Maloyaroslavets and reported it to Kutuzov in time.
General Miloradovich's
vanguard earnestly reported to Kutuzov that Napoleon had transferred his main advance from the old Kaluga road to the new one.
General Delzons commanded the lead units going to the town of Maloyaroslavets. The bridge and dam across
Luzha River were destroyed by order of local authorities (mayor of Maloyaroslavets P. I. Bykovsky and official S. I. Belyayev). Bykovsky destroyed the permanent bridge, and an attempt to build a
pontoon bridge failed due to the intervention of Bykovsky's associate, Belyayev, who destroyed the dam in the evening of the 23rd, and the water washed away the unfinished bridge. Before Belyayev destroyed the dam, Delzons managed to place but only two of his
battalions in the town. The rest of Delzons' soldiers crossed the river and began to enter the city only in the morning on the 24th by building a pontoon bridge next to the destroyed one. Then Delzons'
division attacked the heights on which the town rested. ==Battle==