Posting names DOES work. More than one cousin has responded to this simple note.

Names, in the hope of finding Internet Cousins
Thomas L. Brashier, Sarah Lindsay, William Parks, Rachel Slimp or Schlemp, Mary Daugherty, John Isaac Dougherty, Cynthia Dougherty, Samuel Henderson, Cynthia Martha Parks, Rachel Jane Hughes, Margaret Knox, Christiana Boyd, Jane C. Tindall, John Levi Costner, Susanna Rudisill

Something ever comes of all persistent inquiry; we are not so continually curious for nothing.
Posted by Hershel Parker at 8:49 PM

Cynthia Dougherty Bell and Robert Knox Bell

2 grandfathers of Robert Knox Bell were at King's Mountain and another man who was there was his Great Grandfather 2 times; in addition several granduncles and a cousin or two were there.

King's Mountain: The Turning Point in the Revolutionary War

Won by the Overmountain men with the help of a few locals conspicuous among whom were the members of the Ewart Clan. Not named in the 1877 book by C. L. Hunter are Aunt Margaret Ewart Adams's husband and son whom she rode to see on that unruly stallion the day after the battle.
A Costner uncle was there, Thomas, and other (mainly German) uncles and cousins not known to be kin to the Ewarts.

James Johnston monument at King's Mountain

Uncle James, married to a Ewart, but apparently also a Knox, kin to his brother-in-law Robert Knox.