Newly Identified Diseases Offer Fresh Insight into Napoleon’s Russian Retreat Disaster
A new analysis of skeletal remains is shedding light on the horrific conditions endured by Napoleon’s Grand Armée during its disastrous 1812 retreat from Russia, identifying paratyphoid fever and relapsing fever as significant contributing factors to the estimated 300,000 deaths. While starvation, cold, and exhaustion were undoubtedly primary causes, researchers say these newly identified infectious diseases paint a more complete picture of the soldiers’ suffering.
The Scale of the Catastrophe
The retreat from Russia in October 1812 remains one of history’s most devastating military failures. Facing a brutal winter and relentless harassment from Russian forces, Napoleon’s army was decimated by the elements and disease. Previous research, focused on a mass grave in Vilnius, Lithuania, had already identified evidence of typhus and trench fever among the fallen. However, a new study utilizing advanced genomic sequencing techniques has revealed a more complex epidemiological landscape.
Advanced Sequencing Uncovers Hidden Pathogens
The latest research, published in the journal Current Biology, employed shotgun sequencing – a method capable of identifying fragments of DNA from a wide range of pathogens – to analyze the teeth of 13 soldiers previously unstudied. This contrasts with earlier work that relied on nested PCR, a technique focused on screening for specific diseases.
“I think that the key thing of why [the retreat] was such a failure was the cold and the hunger and so on. With or without infectious diseases, they would have died massively anyway,” explained Nicolás Rascovan, head of the microbial paleogenomics unit at the Institut Pasteur and an author of the study. “But I think what this [does] change is some of our knowledge of all the infectious diseases.”
The analysis revealed that one soldier was infected with Borrelia recurrentis, the bacterium responsible for relapsing fever, a disease transmitted by lice. Four others carried Salmonella enterica, the cause of paratyphoid fever, typically spread through contaminated food or water. The team also suggested one of these four soldiers may have been simultaneously battling relapsing fever.
Symptoms Align with Historical Accounts
Researchers note that the identified diseases align with historical descriptions of the symptoms experienced by Napoleon’s soldiers, including recurring fever and debilitating diarrhoea. Interestingly, the new analysis did not detect traces of the bacteria causing typhus or trench fever, although researchers caution this could be due to DNA degradation over time, insufficient DNA quantity, or the possibility that those diseases were simply absent in this particular sample group.
“The science is interesting because I think it does something which a historian couldn’t do,” said Dr. Michael Rowe, an expert in European history at King’s College London, referring to the identification of the specific diseases.
A Multifaceted Tragedy
The study’s findings suggest a scenario where soldiers succumbed to a combination of factors: debilitating fatigue, extreme cold, and a confluence of infectious diseases. While not necessarily fatal on their own, diseases like relapsing fever could have severely weakened individuals already on the brink of collapse.
However, experts caution against attributing the army’s devastation solely to environmental factors and disease. Dr. Rowe emphasized that focusing exclusively on these aspects “underplays the Russians and it underplays the fact that they actually do some very clever things and that they [have] got a very good strategy and they’ve got actually quite a sophisticated army.” The Russian military’s strategic acumen and resilience played a crucial role in Napoleon’s defeat.
The research team conducted rigorous statistical tests to validate their findings, confirming the authenticity of the ancient DNA and tracing the evolutionary origins of the identified bacteria. This study underscores the power of paleogenomics to illuminate the hidden complexities of historical events, offering a more nuanced understanding of the human cost of war.
