Short answers, pulled from the story.
The Hazen Brigade Monument commemorates the battle that occurred on the 31st of December 1862. The monument was built during the summer of 1863 by members of Hazen's Brigade to honor their fallen comrades.
The project carried official sanction and was probably authorized by Hazen himself and Col. Isaac C. B. Sunman of the 9th Indiana Volunteers. A construction detail under Lt. Edward Crebbin placed the monument on private property within the middle of the brigade cemetery in Round Forest.
In 1930, administration of the Hazen Memorial and the National Cemetery officially consolidated into the Stones River National Military Park. In 1933, administration of the Military Park transferred from the War Department to the National Park Service.
Short-story writer and journalist Ambrose Bierce visited the Hazen Brigade Monument for a second time in 1907 after having known Hazen well as a staff officer. He published an eerie psychological tale called A Resumed Identity in 1908 where the Hazen Monument plays a critical role in the story's twist ending.
Workers repairing the Monument discovered objects buried within its fill including two bullets eight buck and ball shot and a lead disk. They also found a freshwater mussel shell two bone fragments six horse teeth and two small wood fragments embedded in the earth.