My 5th great-grandfather, Ephraim Chapin, a great-grandson of Deacon Samuel Chapin, a founder of Springfield, Massachusetts, was born on October 28, 1729, in Springfield, Massachusetts. He married in 1755 his second cousin once removed, Jemima Chapin (a great-great-granddaughter of Deacon Samuel Chapin).
The 1924 Gilbert Chapin genealogy reports that Ephraim was a captain in the French and Indian War, and was at Ticonderoga (which doesn't quite fit the timeline of his enlistment - see below).
The DAR Genealogical Research Database indicates that Ephraim (DAR Ancestor# A020751) served as a captain under Colonel Ruggles Woodbridge.
Service: Massachusetts Rank(s): Captain
Birth: 10-29-1729 Springfield Hampshire Co Massachusetts
Death: 10-12-1805 Springfield Hampshire Co Massachusetts
Service Source: MA Sols & Sails, Vol 3, p 310
Service Description: 1) Col Ruggles Woodbridge, 8th Co, 1st Regt, Militia
I wrote about the multi-volume Massachusetts Soldiers and Sailors in the Revolutionary War at Stephen Lowell in the Revolution. I returned to this to find my Chapin ancestor.
There are 15 pages of men with the surname Chapin!

