In 1835 he moved to Egypt in Colorado (now Wharton) County and established himself as a sugar and cotton planter. On February 1, 1836, with the outbreak of the Texas Revolution, Heard was elected first lieutenant of Capt. Thomas J. Rabb's company of volunteers, but when the army was reorganized on April 2 he was elected captain of what became Company F of Col. Edward Burleson's First Regiment, Texas Volunteers. At the battle of San Jacinto Heard's company was in the middle of the Texan line opposite the Mexican artillery and overran and captured the enemy cannons. Heard was discharged at Victoria on May 13, 1836.
On September 28, 1838, he was elected chief justice of Colorado County, where in 1840 he owned 1,200 acres of land, seventeen slaves, forty-five cattle, a workhorse, and a clock. In that year he was elected chief justice of Wharton County and accompanied Col. John H. Moore's expedition against the Indians of the upper Colorado River. Heard was elected justice of the peace of Beat One of the judicial Ward County on February 24, 1841. When Mexican general Adrián Woll invaded Texas in 1842, Heard raised a company of twenty volunteers and was assigned to the command of the defense of Victoria. He arrived there on the evening of March 6 to find "the citizens badly armed and in great confusion." Upon receiving reports that a force of 1,100 of the enemy were marching toward Victoria from Refugio and that 3,000 more were near San Antonio, with an additional 14,000 reinforcements still beyond the Rio Grande, he wrote to the editor of the Telegraph and Texas Register, "I have no doubt, from all I can gather that there is an invasion at hand," and resolved to fall back beyond the Lavaca River the following day. "I cannot risk myself and men here longer than tomorrow evening without help," he wrote. After Woll's withdrawal, however, Heard and his men returned to their homes. By 1850 Heard reported real-estate holdings worth $16,888. His wife died on June 18, 1855; they had two daughters and two sons. Heard later married a widow named Ester Glass. In 1866 he moved to what was said to have been a model plantation at Chappell Hill, where he died on August 8, 1874. He is buried at the Chappell Hill Masonic Cemetery.
30° 09.238, -096° 15.642
Texas State Cemetery