What do you mean by 1? The Russians did not take many combat casulaties in chasing the French out of Russia.If that is the case, how to explain :
1 - the important russian losses
2 - the fact that the coalition (including the prussian) numbered "only" 200,000 men at the start of the german campaign in early 1813 ?
2 - Hows that a problem. The Rusisans are at less than half strnegth, the Prussians are a tiny army..
Half the Army was not under the French flag or subject to a French bureaucracy, There were foreign Armies. Reading the RUssian tralation it seem bnot to include foreign armies. Bavarain, Wuttermburg, Westpahila, which is around half the army and suffered the worst losses.This are actually good question. The files contains every man that was under french flag, be it french or not. The exception are foreign armies like the prussian or the austrian for example.
Please note that Sokolov recently try to improve the work of Houdaille (with 8432 files analysed) and come up with very similar results : (in russian) https://imo.sgu.ru/sites/imo.sgu.ru/files/2019/09/o._v._sokolov_337-343.pdf and a google translate : Google Translate
"Thus, the percentage of losses obtained on the basis of the analysis of track records, namely 45%, is completely reliable. Considering that about 1 million 800 thousand people were called up under the banner, it can be concluded that the total number of irretrievable losses of the French regiments in the era of the Consulate and Empire was a little more than 800 thousand people. Taking into account the foreign units serving Napoleon (directly in the ranks of the French army), probably about 900 thousand people. It should be noted that in the ranks of the “French” regiments, a large number of ethnic Germans, Italians, Belgians, and Dutch were subjects of the Empire."
This and otherc omments seem to be ony regiments the were directly part of the French army are incuded.
Well most descriptions I've seen do,The only reinforcement I’m aware of are the garrison in Vilnius and the northern army. I never read of reinforcement from France or Germany.
The losses are totally in line with the demographic studese from what I can see. They only do French Army losses and about half the losses in Russian were not French army losses.Yes that’s the numbers that are "traditionnal", but the primary sources (not memoirs but civil and military registries) and the demographic analysis tends to prove that it was not that huge. But again maybe the discrepancies are due to the difference between people not available in the army and people definitively irretrievable.
These studies are syaing 900,000 "Frenchmen" (those in the exanded borders of France under Napoloen )died. within this 200,000 in Russian (half the 400,000 as the otehr half were not French) is totally consistent nothing in this study contradicts the numbers used by historians.