He participated in many battles and would rise through the ranks to reach Captain status during the fight for Texas independence from Mexico.
During this time, a meeting would be held at Salvador Flores Ranch that would organize a volunteer force of Texas ranchers that would favor the impending revolution.
The Texian Army would become a mixture of all peoples, interested in freedom from the oppressive policies of Mexican President Antonio López de Santa Anna.
Trying to sustain the momentum, Commander Austin deemed it necessary to take possession of Presidio La Bahia (Goliad) and Béxar (San Antonio).
[14] On October 23, 1835, Stephen F. Austin granted a captain's commission to Juan Seguín, authorizing him to form a company, which would be supplied with guns and ammunition by the provisional government.
[15] Austin's aide, William T. Austin, asserted that "These mexicans [sic] being well acquainted with the country, were of important service as express riders, guides to foraging parties, &c."[16] Several days later Salvador Flores and Manuel Leal joined the effort with 41 Tejano volunteers from ranches southwest of San Antonio.
While Seguin would be immediately tasked with the burden of supplying the Texian troops with food and provisions,[15] Salvador was left to reconnoiter the Missions at San Antonio and handle the militia.
At Mission San Jose, they accompanied James Bowie, with the orders to approach the city, by following the river's path into town.
[19] Four groups, led by Valentine Bennet, Andrew Briscoe, Robert M. Coleman, and Michael Goheen and their scouts, were also sent to explore the other missions.
After the fight and learning of the plan to siege Béxar, he would recruit more men from the ranches on the San Antonio River.
[23] On November 14, Austin instructed Flores to "burn off the whole country from the other side of the Nueces to the Medina on the roads from Laredo and the Rio Grande.
He would advance with troops to aid in the capture of the Alamo at the Siege of Bexar and the removal of Mexican forces of General Cos from Texas.
[25][citation needed][Note 3] After the surrender of Cos, his company was sent out to protect the families of the lower ranches, against the devastation made by the retiring Mexican troops and from the reprisal of hostile Indians.
On January 22, verbal intelligence was directed at Col. Neill, from a Tejano courier through the Jose Antonio Navarro family.
[27] Jose Cassiano brings news that Gen. Santa Anna had arrived at Saltillo on January 27, with approximately 3000 troops and Sesma at Rio Grande City with 1600 more.
Col. Neill forced to leave on urgent family matters, makes a quick muster roll of his men at the Alamo.
Blas María Herrera, a courier, from Plácido Benavides,[32] was searching for Juan Seguin at the party and could not locate him.
[33] Travis now forewarned, remarked that it would take about 13 days for the Mexican army to arrive, and still was not immediately concerned with the information received and the party continued into the night.
About a dozen of Seguin's men were so convinced, that they requested to leave,[36] in order to remove their families from Santa Anna's path.
As troops would march away from Gonzales, Salvador Flores along with a group of volunteers formed the rear guard that protected the fleeing families and proceeded westward to secure the lower ranches of San Antonio.
Salvador Flores would protect the colonists as a participant in the Henry Karnes campaign against the hostile Comanche Indians.
[citation needed][51] Again he would be involved in 1842 in organizing San Antonio citizens concerned with the imminent re-invasion by Mexico.
Assigned as Captain by Mayor John William Smith, he would command 100 local Tejanos against the Mexican invaders led by General Adrián Woll.
Note that Seguin's men at the Alamo were scouts/couriers going in and out, between San Antonio and nearby Gonzales, the rallying point for volunteers.