how many recorded instances exist of American settlers using diseased blankets against Indians

GPT-5.4

Vote: fewer than 5

The strongest documented case is the 1763 Fort Pitt incident, where British officers discussed and distributed smallpox-contaminated items to Native people. That is the clearest recorded example. Beyond that, many claims are repeated in popular discussion, but historians generally find very few well-documented incidents with direct evidence of diseased blankets actually being used intentionally by settlers or colonial authorities. So the best answer is not exactly 1, because there are a small number of alleged or possible cases in the record. But it is also not more than 5 based on solid documentation. The most defensible choice is fewer than 5.

Grok 4.1 Fast

Vote: exactly 1

The most well-documented and recorded instance of using diseased blankets against Native Americans occurred in 1763 during Pontiac's War at Fort Pitt. Captain Simeon Ecuyer distributed smallpox-infected blankets to Delaware Indian emissaries, with approval from Lord Jeffery Amherst. This event is extensively recorded in primary sources like Ecuyer's journal and Amherst's correspondence. Historians, including those from the Smithsonian and academic works like Elizabeth Fenn's 'Pox Americana,' identify this as the only reliably documented case. Other alleged instances, such as vague claims during later Indian Wars, lack primary evidence and are considered apocryphal or unsubstantiated rumors. No other specific, recorded events meet the criteria of 'American settlers using diseased blankets.' Thus, exactly one instance exists, making A the precise answer over broader categories like B or C.

Gemini 2.5 Flash

Vote: exactly 1

Historical consensus strongly points to one primary, well-documented instance of American (colonial British) forces intentionally using smallpox-infected blankets against Native Americans. This occurred during the Siege of Fort Pitt in 1763, involving British officers Lord Jeffrey Amherst and Colonel Henry Bouquet. While there were numerous devastating smallpox epidemics among Native American populations, and discussions or suspicions of biological warfare, the Fort Pitt incident is unique due to the explicit intent documented in surviving correspondence between Amherst and Bouquet. Other alleged instances lack the same level of concrete, undeniable historical record. Therefore, based on the availability of clear historical records detailing the intent and action, 'exactly 1' is the most accurate answer for recorded instances of *intentional* use.

Final Summary

The AI Roundtable wrestled with the murky intersection of historical record and colonial lore, ultimately failing to reach a unanimous verdict. While Grok 4.1 Fast and Gemini 2.5 Flash formed a majority around a singular recorded event, GPT-5.4 stood as a cautious dissenter, arguing that historical ambiguity makes a count of 'exactly 1' too restrictive.

No agreement after 1 rounds of discussion. Final vote: fewer than 5: 1, exactly 1: 2

Strongest Arguments

• exactly 1: Primary sources like Captain Ecuyer's journal and the correspondence of Lord Jeffery Amherst provide the only concrete, undeniable evidence of intent and action, making the 1763 Fort Pitt incident the sole recorded instance.
• fewer than 5: The existence of other alleged or possible cases in the historical record makes a broader count of 'fewer than 5' more defensible than the rigid claim that only one such event ever occurred.