Epidemics Resulting from Wars

In Short

Friedrich Prinzing's comprehensive historical treatise examines how military operations spread devastating infectious diseases throughout human populations. Drawing on extensive archival statistics and medical reports, the book tracks outbreaks from the fifteenth century through the Russo-Japanese War. It demonstrates that overcrowding, poor sanitation, forced quartering, and troop movements consistently ignite deadly epidemics of typhus, smallpox, plague, dysentery, and scurvy. These contagions spill over from armies to civilian communities, altering military outcomes and wiping out entire populations. The work endures as a meticulously documented foundation for understanding the catastrophic, indirect human costs of warfare.

The Story

The work traces a rigorous chronological path to demonstrate how armed conflicts serve as the primary engine for global disease transmission. It begins in the late fifteenth century, citing the sudden emergence of the English sweating-sickness among the troops of Henry VII in 1486. The narrative expands into the massive devastations of the Thirty Years' War between 1625 and 1640, where marching armies carried bubonic plague, typhus, and dysentery across North and South Germany. In Saxony and Württemberg, armies left viral trails that decimated three-fourths of regional populations, leaving cities like Ulm strewn with dead bodies in the streets.

Moving into the eighteenth century, the narrative details how the Russo-Turkish conflicts spread bubonic plague across the Danube into Central Europe, frustrating military campaigns and killing vast numbers over seven-year stretches. The focus shifts to the Napoleonic era, particularly the campaigns of 1813–1814. Here, crowded field lazarets and the forced quartering of retreating French, German, and Russian troops spread "hospital fever" (typhus) across major cities like Frankfurt, Paris, Rouen, and Tours.

The historical arc proceeds into mid-nineteenth-century conflicts, including the American Civil War, the Italian War of 1859, the Danish War of 1864, and the Austro-Prussian War of 1866. It highlights how improved logistics, shorter campaigns, and vaccination efforts began to mitigate mortality, though typhoid and dysentery remained persistent threats. The analysis deepens during the Franco-German War of 1870–1871, where a massive smallpox outbreak among French troops and prisoners swept across Germany, England, Scandinavia, and eventually reached North America and Asia.

Finally, the study examines specialized military conditions, focusing on the horrors of besieged fortresses. Detailed accounts of the Siege of Mantua (1796–1797) and the Siege of Port Arthur (1904–1905) show how complete isolation, extreme heat or cold, bad drinking water, and lack of fresh rations trigger compound crises of malaria, typhus, dysentery, and scurvy that utterly incapacitate defending garrisons. The work concludes that while modern medicine and isolation protocols gradually reduced military disease mortality, history proves that war-pestilences remain an inseparable, devastating shadow of human combat.

How It Unfolds

Outbreaks in early modern warfare The text establishes early patterns of war-related contagions, beginning with the mysterious 1486 appearance of English sweating-sickness among Henry VII's troops. It then details the Thirty Years' War, where troop movements introduced bubonic plague and typhus, reducing Württemberg's population from 444,800 to 97,300 in seventeen years.

The spread along eighteenth-century campaign trails Imperial armies moving along the Danube during the Russo-Turkish Wars transport bubonic plague throughout Hungary, Poland, and Austria. Lack of isolation in military hospitals in Jassy causes typhus to spread rapidly among soldiers and civilians alike.

The Napoleonic hospital crisis Overcrowded lazarets during the 1813–1814 campaigns turn cities like Frankfurt and Paris into centers of typhus transmission. Retreating armies transport infected soldiers on riverboats down the Seine and Loire, carrying "hospital fever" to cities like Rouen and Tours.

Mid-century conflicts and smallpox pandemics Statistical analysis of the Franco-German War shows how infected French prisoners spread smallpox across German states like Prussia and Saxony. The contagion spreads internationally via trade and emigration routes, reaching Scotland, Sweden, Finland, and North America.

The pressure of sieges The narrative concludes by examining isolated garrisons at Mantua and Port Arthur, where blockades create lethal combinations of typhus, dysentery, night-blindness, and scurvy. In both cases, disease forces or hastens final surrender by leaving thousands of soldiers incapacitated in bare, floor-bound lazarets.

The People

While the work operates primarily as a historical and statistical analysis, specific historical figures and medical authorities appear throughout the text to illustrate key positions, decisions, and observations regarding war-epidemics.

• Henry VII: The English monarch whose victorious troops in 1486 brought English sweating-sickness into England, triggering a rapid epidemic that killed one-third of the inhabitants in many towns.
• Saxon Staff Surgeon Neumann: A military physician who argued against isolating typhus patients together. He believed that congregating infected soldiers concentrated body exhalations and intensified the poison, advocating instead for mixing patients—a practice that inadvertently accelerated the disease's spread.
• Physician Orraeus: A medical expert commissioned in 1770 during the Russo-Turkish War to investigate widespread sickness in Moldavia and Wallachia after military leaders initially refused to admit the presence of bubonic plague.
• General Würmser: The Austrian commander whose 12,000 troops entered besieged Mantua in 1796, bringing thousands of wounded and sick men who quickly overwhelmed the city's unsanitary, floor-only hospitals with hospital fever and tetanus.
• Dr. Flinzer: A medical researcher who compiled exhaustive statistics during the 1870–1871 smallpox epidemic in Chemnitz, demonstrating that unvaccinated residents suffered a 46.3 percent infection rate compared to just 1.8 percent among vaccinated residents.

In Its Own Voice

"In one day either the disease or the patient came to an end."

Fracastorius describes the extremely rapid, fatal progression of English sweating-sickness during its initial outbreaks among fifteenth-century soldiers.

"In the morning many dead bodies would be found lying in the streets and in front of houses."

The text captures the sheer scale of urban collapse during the 1635 plague in Ulm, where thousands of fleeing rural refugees died alongside city residents.

"Anybody who lies in a bed to which the poison is still clinging will without fail contract the disease."

Staff Surgeon Neumann warns of the dangerous persistence of typhus infection within unsanitary military barracks and lazarets.

What It's Really About

The work argues that disease is an inescapable, primary product of warfare rather than a mere secondary side effect. It demonstrates that military movements systematically destroy public health infrastructure, create mass migrations of vulnerable refugees, and force human beings into overcrowded, unsanitary conditions ideal for pathogens.

Underneath its dense presentation of death tallies and troop movements lies a broader question about the true cost of human conflict. By showing how contagions easily jump from military camps into surrounding civilian communities, the text proves that war cannot be contained to a battlefield. The ultimate target of any military campaign is inevitably the civilian population, which pays for strategic maneuvers in plague, typhus, and smallpox.

Why Read It Today

This work appeals to readers of military history, public health, and historical epidemiology who value rigorous, unvarnished statistical evidence over narrative drama. Reading it feels like sitting down with a painstaking nineteenth-century archivist who insists on showing every hospital register, mortality table, and campaign map to prove his point.

The book does present distinct reading challenges. It is densely packed with localized casualty figures, long lists of obscure German and European villages, and primary medical terminology from past centuries. It lacks traditional narrative storytelling or individual character arcs, offering instead a methodical, cumulative weight of evidence.

Yet what stays with the reader is the terrifying speed with which war destabilizes society's defense against infection. The detailed accounts of crowded hospital floors, infected river transport boats, and cities losing three-quarters of their populations provide a sober, essential reality check on any romanticized view of military history.