David Hackney was born on May 10, 1837, probably in Indiana, to John and Rachel Hackney. His father was a farmer, and his parents probably died in the 1850s. By 1860, he was working as a farm laborer in Heltonville, Indiana, and he owned $45 of personal property.
He enlisted in the Union army on September 20, 1861, and he mustered in as a private in Company G of the 31st Indiana Infantry later that day. The regiment took part in the Battle of Fort Donelson, the Battle of Shiloh, the siege of Corinth, the Battle of Perryville, the Battle of Stones River, the Battle of Chickamauga, and the Atlanta campaign. At some point, army officials made him a wagoner. He mustered out on December 8, 1865.
Hackney returned to Heltonville after the war, and he married Sabra Covey on November 4, 1867. They had at least six children: Homer, born around 1869; Sarah, born around 1871; Jane, born around 1873; Nellie, born around 1875; Josie, born around 1876; and Stephen, born around 1878. He earned a living as a farmer. He applied for a federal pension in November 1886 and eventually secured one. His wife died around 1890.
On March 6, 1900, he was struck by a train and thrown at least twenty feet into the air. According to one reporter, the ”passenger train was running slow, and when some 35 feet from Mr. Hackney the engineer saw him and blew several warning blasts on the whistle, but failed to attract his attention.” A doctor noted that he had four broken ribs and several cuts and bruises on his head. He died in Bedford, Indiana, on March 7, 1900.