There are some similarities in what you report here to what I have on my Fierros connection. First, we use Fierros with an s at the end, which may be a dirivitive. My ggrandfather, his brothers and their sons were involved with the Revolution. His name was Francisco Fierros b 1861-Camargo,Mex. d 1943-Laredo, Tex. His father was Leocardio Fierros and his mother was Valentina Garcia Fierros. Not much else is known about their lives, except that by 1915, they had been living in Laredo, Texas and he served as sheriff for a while. Any connections to your line?