Jacob Snively moved to
Nacogdoches,
Texas,
Republic of Mexico in April, 1835 where he was a surveyor of land grants for the Mexican government and received his own land in July, 1835. Commissioned on March 26, 1836, during the
Texas Revolution he served as a first lieutenant of Company A, First Infantry Regiment under
Henry W. Millard. In August he was promoted to captain and assigned to command of Company B. Sam Houston appointed him an ambassador to the
Shawnee Indians on January 24, 1837, to sound out the tribe's intentions towards the Republic of Texas and Mexico. On May 13, 1837, he was appointed to the rank of colonel and made
paymaster general of the Army, and for a short time was acting secretary of war, before resigning from the army in September 1837. During the time of his resignation from the army, he served as Captain, September 14–December 13, 1838, of a group of Texas Mounted
Rangers in the 1st Regiment of Mounted Gunmen/Battalion of Volunteer Rangers commanded by Major Leonard H Mabbitt. Later in 1839, he once again served as paymaster general under
Albert Sidney Johnston and in 1843 was quartermaster of the army and an assistant inspector general of the republic. ==Snively Expedition==