• Bouton, Nathaniel, et al, eds., Documents and Records Relating to New Hampshire, 1623-1800, 1867-1943. In 9:475-476, "To His Excellency Benning Wentworth ... May ye 17th 1746. The Humble Petition of the Inhabitants of the District of Litchfield ... That Whereas we have Requested to be Erected into a Town ... David Campbell ..."
• Cochrane, W.R., & George K. Wood, History of Francestown, N.H., 1895. On p. 565: "William Campbell, Jr., was the grandson of David Campbell, who emigrated from Scotland and settled in Litchfield, where he was drowned in 1777 at the age of eighty-five years. ... William Campbell, Jr., was born in Litchfield as was his father, William, Sr."
• Cutter, William Richard, New England Families, Genealogical and Memorial, 1915. In 4:1664, "David Campbell, the first known ancestor in America of the Litchfield Campbells, came to this country before 1746, when he was in Litchfield, New Hampshire. It is reasonable to infer that he was among the Scotch-Irish immigrants who settled in New Hampshire early in the eighteenth century. He died December 3, 1777, aged about fifty-six years."
• Hill, Luther B., A History of the State of Oklahoma, 1910. In 2:271, "Deacon John Smith, Jr., married Elizabeth Campbell, who was born in Litchfield, New Hampshire, a descendant of David Campbell, who was a member of the colony of Scotch Presbyterians who came from the province of Ulster, Ireland, to America in 1719, locating in Rockingham county, New Hampshire."
• Hurd, D. Hamilton, compiler, History of Hillsborough County, New Hampshire, 1885. On p. 492-496: "At the first annual March meeting in 1750 the following [Litchfield] town officers were elected ... William McQuesten and David Campbell, fence-viewers ... Selectmen and Assessors ... 1770-72 - William McQuesten, David Campbell, Daniel Kendall ... The following physicians have practiced in Litchfield ... David Campbell ..."
• Lord, Edward Oliver, A History of the Town of New London, Merrimack County, New Hampshire, 1779-1899, 1899. On p. 469: "Lewis [Fisher] m., June 2, 1818, Betsey, dau. of William and Hannah (Johnson) Campbell of Francestown. William Campbell was the grandson of David Campbell, who emigrated from Scotland and settled in Litchfield about 1750. William was in the battle at Bunker Hill, and later in the war held the rank of sergeant."

• 1810, res. Francestown, Willm Campbell, 01101-10201; Wm Campbell, 00110-11100; Robt Campbell, 10110-00110 [USA, 1810 Census, New Hampshire, Hillsborough County]
• 24 Nov. 1840, "I Hannah Campbell aged eighty five years depose that I was well acquainted with Benjamin Falch late of Topsham in the State of Vermont deceased while he lived in Francestown in the State of New Hampshire from which place he removed to Topsham something more than thirty years ago. I was present when the said Benjamin was married to Sarah Campbell who as I understand now resides as his widow in Yorkshire NY. According to the best of my recollection the marriage took place in the year 1779. I was myself married to her brother William Cambell in the year 1778 & I think the said Benjamin & Sarah were married the next year. They were married at the house of Hugh Montgomery in said ... in whose family she had previously lived. They were married by Revd Seward Goodridge then the settled minister of the town of Lyndeborough in said State of New Hampshire. I know of no other person now living who was at the wedding. I was well acquainted with the said Benjamin & Sarah from the time of their marriage until they removed to Topsham as above mentioned & know that during all that time they lived together as man & wife. Hannah Campbell" [USA, Revolutionary War, Pension Files]
• Cochrane, W.R., & George K. Wood, History of Francestown, N.H., 1895. On p. 142, 254-262, 282-283, 565: "Tax List of 1793 ... William Camble"; "What Francestown men were in the Battle of Bunker Hill cannot now be positively stated. But it is certain that William Campbell ... participated in that struggle. ... I find among the state papers this record: 'From Francestown a party of seven men, under William Campbell, Sergeant, marched July 7, 1777, and returned home, hearing of the retreat, and were out five days.' ... The pay-roll of those who went on the first alarm from the approach of Burgoyne, gives the names of William Campbell (sergt.,) ...; and at the last alarm, several others marched with them. Thus the above-named ... participated in that memorable battle under Stark, which was the beginning of Burgoyne's overthrow. The State War Rolls tell us that 'Serg. Campbell's Detachment' was 'raised out of Captain John Carson's Company of Militia' ... Names of Revolutionary Soldiers ... William Campbell Sergt."; "Francestown 'voted (Mar. 14, 1791) to Astablish the Clases for School as they now Stand.' ... districts established in legal form in 1806 ... No. 2 ... David Felch, William Campbell, William Campbell, Jr., ..."; "William Campbell, Jr., was the grandson of David Campbell, who emigrated from Scotland and settled in Litchfield, where he was drowned in 1777 at the age of eighty-five years. ... William Campbell, Jr., was born in Litchfield as was his father, William, Sr."
• Lord, Edward Oliver, A History of the Town of New London, Merrimack County, New Hampshire, 1779-1899, 1899. On p. 469: "Lewis [Fisher] m., June 2, 1818, Betsey, dau. of William and Hannah (Johnson) Campbell of Francestown. William Campbell was the grandson of David Campbell, who emigrated from Scotland and settled in Litchfield about 1750. William was in the battle at Bunker Hill, and later in the war held the rank of sergeant."

Looking at the quotations from the various sources listed for David Campbell, one can easily spot contradictory information. Did David Campbell die at age 56 or 85? Was he born in 1692 or 1721?

More subtly, the William Campbell who was born in 1751 in Litchfield is said to be the son of William Campbell Sr. and grandson of David Campbell. The 1810 appearance of William Campbell Jr. gives his age as at most 45, so the William Campbell born in 1751 must be the William Sr. of 1810, and undoubtedly of 1806 as well.

David Campbell appears in the records of Litchfield between (at least) 1746 and 1772. But we have no evidence for an adult William Campbell before 1776. The theory that the William born 1751 was the son of a William Sr. would imply that an adult William Campbell ought to have been living in Litchfield in the 1750s, but we find no evidence that such an individual even existed.

Some family historians have already assumed that David (born 1759) and Elizabeth (born 1763) were children of David Campbell. Although other family historians have reported that William (born 1751) was a son of William Sr. (for whom no evidence has been found), we have decided that he was more likely a son of David Campbell. According to Revolutionary War pension applications, Sarah (born 1760) is definitely a brother of William (born 1751), and therefore should be a daughter of David Campbell. We have not seen any conjecture for the parents of Mary (born 1748), but given that she also was born in Litchfield, it seems likely that she was also a daughter of David Campbell.