More than a century ago, 110 Black soldiers were convicted of murder, mutiny and other crimes at three military trials held at Fort Sam Houston in San Antonio. Nineteen were hanged, including 13 on a single day, Dec. 11, 1917, in the largest mass execution of American soldiers by the Army.

The soldiers’ families spent decades fighting to show that the men had been betrayed by the military. In November, they won a measure of justice when the Army secretary, Christine E. Wormuth, overturned the convictions and acknowledged that the soldiers “were wrongly treated because of their race and were not given fair trials.”

On Thursday, several descendants of the soldiers gathered at Fort Sam Houston National Cemetery as the Department of Veterans Affairs dedicated new headstones for 17 of the executed servicemen.

The new headstones acknowledge each soldier’s rank, unit and home state — a simple honor accorded to every other veteran buried in the cemetery. They replaced the previous headstones that noted only their name and date of death.

(The families of the other two who were hanged reclaimed their remains for private burial.)

The headstones were unveiled after an honor guard fired a three-volley rifle salute, a bugler played “Taps” and officials presented the descendants with folded American flags and certificates declaring that the executed soldiers had been honorably discharged.