William Horne was killed by the Indians during the raid upon Dover when the Waldron Garrison House and several other garrisons were burned and many inhabitants were massacres and a number of prisoners were taken either to Maine or to Canada. Genealogical Items relating to Dover, NH (New England Historic Genealogical Society online)

William¹Horne taxed at Cochecho 1659-1677; killed 28 June 1689; inventory entered by his widow Elizabeth 15 July 1699 Genealogical Dictionary, Maine and New Hampshire, Surnames, G-H, Page 350

William Horne of Dover 1659, betw, Cochecho and Tole End from Edw. Starbuck 27 Sept 1661. He had been of Salis., the home of his w. Elizabeth² Clough (John¹), named in her fa.'s will 1691. William Horne 1691/2 Dover [Inventory of the estate of William Horne of Dover, Feb. 27, 1691/2; amount, £189.8.0; signed by Samuel Heard and Thomas Downes; attested by Elizabeth Horne, the widow, July 15, 1699.] [Probate Records, vol. 3, p157.]