American AcornsHeitman, Historical Register of Officers of the Continental Army (1893), p. 190: Gilbert, Joseph and Samuel (Mass.): captains of Prescott's Massachusetts Regiment, 1775-1776. Entries for Joseph Gilbert (1st lieutenant, then captain, Prescott's regiment and the 7th Continental Infantry) and Samuel Gilbert (captain, Prescott's regiment, 1775; 7th Continental Infantry, 1776).
Image · dated 1893 · source: Internet Archive (public-domain scan); heitmanregister00franrich.
Transcription
Word-for-word transcription (spellings kept; uncertain letters in brackets).
Gilbert, Joseph (Mass). 1st Lieu- tenant of Prescott’s Massachusetts Regiment, May to December, 1775; 1st Lieutenant 7th Continental Infantry, 1st January, 1776; Captain, August, 1776, and served to —.
Gilbert, Samuel (Mass). Captain Prescott’s Massachusetts Regiment, May to December, 1775; captain 7th Continental Infantry, 1st January to 31st December, 1776.
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Keep in mind: Officer chronology only (context for a unit named in the person's own record); the page names no Oak, and no personal service is inferred from it. Context for John Oaks of Exeter: his own 1818 declaration names a year's service under Capt. Gilbert and Col. Prescott from about January 1776 (Confirmed as his statement; which Gilbert is meant is not settled).