Gustav Schumann and Augusta Luckenbach

I am searching for information about Gustav Schumann, born 24 November 1854 and wife Augusta Luckenbach born 17 July 1857. Stonewall, Texas is listed as the birth place of both.Their children were Amanda, Emmeli (my great-grandmother), Justina, Augusta, Elsie, Adolph, Harry and Gustav.Any information would be greatly appreciated.