“He collected many facts, for a history”

Another reason I suspect Josiah Waters, Jr., was the “Mr. Waters” who told the Rev. Jeremy Belknap about the Boston Patriots’ intelligence on the march to Concord is that it fits with what people tell us about Waters’s later behavior.

Waters was really interested in preserving military lore. By the mid-1780s he was colonel of the Boston militia regiment. He also served as treasurer of the Ancient and Honorable Artillery Company, and one of the first books about that organization’s members says:

He collected many facts, for a history, but never published them. The manuscript is lost. The older members used to speak of it as containing important facts, as well as anecdotes of members, now preserved in the imperfect recollection of survivors.

Specifically, we know that Waters was passing on stories about the beginning of the Revolutionary War before he died in 1804.

In fact, we have another account of how Dr. Joseph Warren learned about the British army mission that came ultimately from this Josiah Waters. It was published in the New England Historic and Genealogical Register in 1853, and I shared it back in 2020.

That account was transmitted orally through a couple of people before being written down: from Col. Waters to Joseph Curtis to Catherine Curtis and into the journal. As a result, some details got muddled—most notably, the name of William Dawes (Waters’s first cousin) morphed into Ebenezer Dorr.

Putting that account together with what Belknap wrote down in 1775 shows how the two complement each other. Here are the passages about the best-placed informant.

Belknap, 1775:

Mr. Waters informed me, that the design of the regular troops, when they marched out of Boston the night of April 18, was discovered to Dr Warren by a person kept in pay for that purpose. . . . [After gathering early indications something was afoot] Dr. Warren…applied to the person who had been retained, and got intelligence of their whole design; which was to seize [Samuel] Adams and [John] Hancock, who were at Lexington, and burn the stores at Concord.

Curtis, 1853:

The Americans obtained this news, through an individual by the name of Jasper, an Englishman, a gunsmith by trade, whose shop was in Hatter’s Square; he worked for the British, but was friendly to the rebels; a sergeant major quartered in his family and made a confidant of him, telling him all their plans. Jasper repeated the same to Col. Waters, who made it known to the Committee of Safety.

Looking at those sources together, I think it’s likely that the Boston Patriots’ paid informant was William Jasper (d. 1786), a maker of cutlery and surgical instruments from Britain. I gathered all the information I could find about Jasper here.

If these two accounts are basically reliable, Jasper rented rooms to a British sergeant major, who trusted him because of his British birth and his work repairing army weapons. But Jasper was also funneling information to Waters and Dr. Warren in exchange for money.

As I understand it, the British army didn’t formalize the duties of a sergeant major until the late 1790s. But it was already the designation of a senior sergeant with more authority than any other enlisted man in that unit. A sergeant major wouldn’t have been privy to Gen. Thomas Gage’s whole plan. But by late on the afternoon of 18 April he may well have been aware of some crucial variables:

• The troops would leave Boston by water instead of over the Neck, indicating a destination to the northwest rather than, say, Worcester.
• The troops were preparing to travel farther and stay out longer than the training marches of previous weeks.

The man may even have known about those mounted officers sent out as far as Lincoln on 18 April.

With solid but incomplete information, Warren dispatched Dawes and Paul Revere, as well as an anonymous and unsuccessful rider out of Charlestown, out to Lexington to warn Adams and Hancock. Patriots in Concord were already on alert, hiding most of the military supplies stored there. Those mounted officers tipped off Patriots in Cambridge and Lexington. And the result was war.