David Grann · 2023

The Wager

A Tale of Shipwreck, Mutiny and Murder

Rough AI truth score

83/100

The wreck, deprivation, factional break, and court martial are archival facts. Grann's larger point is strongest when he shows how conflicting survivor narratives made a clean verdict impossible.

Based on three central claims · medium-high confidence

The three claims

01Supported

HMS Wager wrecked on a remote island off Chile in 1741 after rounding Cape Horn as part of George Anson's wartime squadron.

Naval and survivor records place the 28-gun Wager in Anson's expedition during the War of Jenkins' Ear. Storm damage, navigational uncertainty, illness, and a lee shore culminated in the wreck in the Chonos Archipelago.

Royal Museums Greenwich: The Wager disaster Historical Society review of The Wager

02Supported

Starvation, command conflict, and Captain David Cheap's killing of a midshipman split the castaways into rival factions, one of which deposed him and sailed away.

Competing eyewitness accounts agree on extreme scarcity, Cheap's shooting of Henry Cozens, the breakdown of naval authority, and separate escape attempts. They disagree sharply about lawful command, mutiny, violence, and culpability.

Royal Museums Greenwich: The Wager disaster A chronological history of discoveries in the South Sea: Wreck of the Wager

03Mixed

The Admiralty court martial avoided the explosive mutiny dispute in order to protect an imperial story of British naval order.

The proceeding narrowed its inquiry and punished no survivor for mutiny, allowing incompatible public accounts to persist. Institutional reputation plausibly mattered, but the evidentiary difficulty, legal jurisdiction, and wartime context also explain the limited verdict.

Historical Society review of The Wager Royal Museums Greenwich: The Wager disaster

Other claims worth checking

Scurvy and inaccurate longitude were structural threats to eighteenth-century naval expeditions.
Printed survivor narratives became weapons in a contest over legal and public legitimacy.

What this number means. It is an AI-generated first-pass judgment of three central factual or causal claims—not a rating, exhaustive fact-check, or human peer review. Claim credits are 100% for supported, 75% for mostly supported, 50% for mixed, and 25% for weak, then averaged and rounded. Lower confidence means the score should move more as better evidence arrives.

Method three-central-claims/0.1.0 · checked 2026-09-01 · 3/3 selected claims assessed · method and source audit