Doan Gang Cave, Buckingham Township, Bucks County, Pennsylvania

The historical case for a Doan Gang connection to this cave rests primarily on a single 19th-century source: an 1859 newspaper account by local schoolteacher Joseph Fell, who described visiting a cave near Centerville and finding the inscription '1775, M. Doan' carved nine feet from the bottom. Historian Clint Flack, who accompanied Gates on the investigation, brings regional expertise to the question of whether physical evidence in the cave could corroborate Fell's account. Without access to the original inscription or independent verification, the connection remains speculative but historically plausible — the Doans were known to operate extensively throughout Bucks County and would have needed safe refuges as colonial and then American authorities closed in on them.

The broader historical record, as sketched out in the Expedition Unknown episode, frames Moses Doan and his brothers as among the most consequential loyalist outlaws of the Revolutionary period. The transcript notes that Washington reportedly called Moses and his brothers 'the greatest threat to the American cause,' and attributes to the gang a robbery of one of the early US treasuries — described as 'the largest ever theft of US public funds' at the time. These are significant claims, and while the episode presents them as part of established local legend, independent verification of some details — particularly the treasury heist figures — should be sought through primary historical sources.

The artifacts recovered during Gates' excavation — a Civil War-era shield nickel and an oil lamp fragment — suggest the cave saw use well into the 19th century, though they do not on their own confirm a Revolutionary-era connection to the Doans. The carved initials in the hidden chamber, particularly the apparent 'M,' are suggestive but not conclusive. Mainstream historians would note that single-letter carvings in limestone caves are common and require careful contextual analysis before they can be attributed to a specific individual. The episode is honest that the investigation raises intriguing possibilities without delivering a definitive answer.

What Gates' visit contributed most clearly is a documented on-the-ground exploration of a site that had largely faded from public awareness since Fell's 1859 account. By physically excavating, mapping the hidden chamber, and recovering datable artifacts, the team established a baseline of evidence that future researchers could build on. The episode frames the cave within the larger Doan Gang treasure legend — the possibility of buried colonial gold and silver — but is careful to present the cave itself as a piece of a much larger, still-unresolved puzzle.