During the Spanish-American War he joined the Beaumont Light Guards, which became Company D, Third Regiment, of the Texas Volunteers. After his return he was elected district attorney of the First Judicial District in 1898. Dies suffered a financial setback when he could not repay a debt to his friend John Henry Kirby. As a result he moved his family to the West Texas town of Colorado City in 1899. In 1908 he defeated the incumbent, Samuel Bronson Cooper, in his campaign for Congress. He represented the Second Texas Congressional District in the Sixty-first through Sixty-fifth United States Congresses (1909-19). During his tenure he opposed large military expenditures, American "imperialism," and high tariffs and supported an income tax. He was an outspoken nativist. Dies was opposed to woman suffrage and in 1916 opposed Woodrow Wilson's preparedness program. He chose not to run for reelection in 1918. He married Mrs. Olive Cline Blackshear on May 15, 1892, and they had two daughters and one son, Martin Dies. The marriage ended in divorce. Dies was a Democrat and a Methodist. He died in Kerrville on July 13, 1922, and is buried in Glenwood Cemetery, Houston.
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