He liked to be out in wilderness places, to loiter and to read, write, and recollect. His writings justify his being called the first Texas man of letters. Early Times in Texas was published serially in Burke's Weekly at Macon, Georgia, in 1867, although it did not appear in book form (and then only as a pamphlet printed on rotten paper) until 1892. The story of Duval's remarkable escape from the Goliad Massacre and of his more remarkable adventures before he rejoined human society became a Texas classic. Of all personal adventures of old-time Texans it is perhaps the best written and the most interesting. The Young Explorers (189?), a narrative with a fictional thread, a book for boys, was published as a sequel to Early Times in Texas. Duval's most artistic and most important book is The Adventures of Bigfoot Wallace, the Texas Ranger and Hunter (1870). Always free and at home with himself, Bigfoot opened up to his old friend Duval with gusto, and Duval helped him stretch the blanket. He died in Fort Worth on January 15, 1897.
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