Eddie ... you probably have all the below but this book is beyond my slender means
Fuel For A Feud (The Taylors, the Tumlinsons, & The Feud)
by Marjorie Lee Burnett M.B. Hyatt, 1990 Texas
https://www.abebooks.com/book-search/title/fuel-feud/author/marjorie-burnett-hyatt/
The site promises, but doesn't deliver
"68 pages matching tumlinson in this book"
https://books.google.co.uk/books?redir_esc=y&id=8RlWAAAAMAAJ&focus=searchwithinvolume&q=tumlinson
This book is more affordable ...
https://www.abebooks.co.uk/9780961493608/Captain-C.B-McKinney-Law-South-0961493607/plp
"Captain C.B. McKinney, The Law In South Texas" (Parsons & Fitterer)
Tumlinson, Alta (group family photo)
Tumlinson, Bell (group family photo, a boy?)
Tumlinson, Benjamin Thomas (group family photo)
Tumlinson, G.W.
Tumlinson, Joseph "Captain Joe"
Tumlinson, Joseph, Dimmit County Sheriff ... several mentions, an enemy of Reynolds
Tumlinson, John G. "Pegleg" (solo photo)
Tumlinson, Joseph "Jody" (group family photo)
Tumlinson, "Little Pete"
Tumlinson, Morelda English (group family photo)
Tumlinson, Walk
John "Pegleg" (1848-Jan 31, 1920), son of Captain Joe
The 1880 Dimmit County census shows him as a 40 year old stock raiser, born in Texas
His address Carrizo Springs Village
Tumlinson had served briefly under Captain Oglesby in the rangers
Master Roll Sept 1 - Nov 30, discharged due to his being elected sheriff
The first sheriff of Dimmit County, elected Nov 2, 1880, re-elected Nov 7, 1882
Re-elected Nov 1884, Nov 1886, Nov 1888, serving until November 1890
Sheriff of La Salle County 1892-1893
As to where Reynolds was in this period ...
N.O. Reynolds joined the rangers May, 1874 until his honorable discharge Oct 7, 1875
Ringo arrested on the disturbing the peace charge, December 1875
Ringo indicted for threatening Sheriff and Deputy, February 1, 1876
Ringo and Cooley surrendered to Burnet authorities in March 1876 and brought to Lampasas County
John Ringo was tried and convicted in Lampasas County, March 1876,
N.O. Reynolds remustered Apr 13, 1876
May 1876, several men freed John Ringo and Scott Cooley from the Lampasas jail