From November 26 to 29, 1812, the last act of the Russian campaign takes place. Napoleon learns that the bridges over the Berezina are in Russian hands. However, it is necessary to pass. The Emperor orders Borisov to be held in order to deceive the enemy and instructs Eblé to build two bridges at the ford of Studianka. Three battles take place around these bridges. In Borisov, General Partouneaux and his division clash with Tchitchagov. It is precisely the desperate combat of General Partouneaux's 12th infantry division and General Delaitre's 30th cavalry brigade which was attached to him a few days before the passage of the Berezina, that this work reconstructs in its entirety. Having to provide only the rearguard of the Grande Armée against three Russian armies, this French division had to resolve to lay down its arms on the morning of November 28, 1812. Faced with such adversity, the surrender became inexorable of its last. The combatants were however the object, not only of a public condemnation on the part of Napoleon, but also of numerous criticisms within the military institution. On their return from captivity, Partouneaux and Delaitre, these two brothers in arms, endeavored to wash away their scorned honor in the 29th Bulletin and the sometimes fanciful stories of the great memorialists of the time, none of whom, however, shared their tragic fate. . Only a few rare survivors were able to bear witness with objectivity and realism to the sacrifice the Emperor imposed on them for the salvation of his army.