In 1832 Smyth and seven other Bevil-area residents, upon hearing of the Anahuac Disturbances, went to the scene but arrived after the excitement was over. Smyth married Frances M. Grigsby in 1834; they had seven children. Smyth became surveyor in 1834 for George A. Nixon, recently named commissioner of the Zavala, Vehlein, and Burnet colonies. He also served as land commissioner at Nacogdoches, where he remained until the office of land commissioner was closed on December 19, 1835. He was appointed first judge of Bevil Municipality by the General Council of the Provisional Government.
|Independence Hall, location of the Declaration signing|
Smyth became the second commissioner of the General Land Office in March 1848, a position he retained for four years. As Democratic elector for president, he voted for Franklin Pierce in the 1852 election. The following year he won a seat in the Thirty-third United States Congress, but he did not seek reelection in 1855. He returned to his farm in Jasper County and by the eve of the Civil War had amassed an estate valued at $27,000, which included twenty-eight slaves. Smyth opposed secession, although his sons served with Confederate troops. After the Civil War, he went to Austin as a delegate to the Constitutional Convention of 1866. He died in Austin on February 21, 1866, and was buried in the State Cemetery. In 1936 the Texas Centennial Commission erected a marker at the Smyth home, built 100 years earlier in Jasper County at the junction of Big Run and Little Walnut Run.
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Texas State Cemetery