Your ancestor's grave was not just a random burial. The location of graves were carefully marked on maps.
They were referred to as 'ghoul maps.' This example of the Gettysburg battlefield was sold as a souvenir. There is one from Antietam, as well.
The maps were based on both soldier's & contractor's reports. Because in the West the Union army almost exclusively universally retain command of the battle space, it was commonplace to hire civilian contractors paid a set rate / burial to collect & inter the dead.
The orderly arrangement of the fallen Confederates is testimony to the intensity of losses along the stout fence from two day's attacks stopped beside the Emmitsburg Road.
The Hazen Brigade Monument at Stones River was commissioned by survivors of the b battle for the Round Forest on Dec 32, 1862. Limestone headstones & a stout stone fence were constructed by immigrant German stone masons. They carved their names on the near by limestone cliff.
During renovations about ten years ago it was discovered that the headstones did not, in fact, mark burials. Instead, the trench burial where Hazen's men stood their ground runs under the monument.
In Gilpin-Faust's 'This Republic of Suffering; Death During The Civil War' she documents the creation of three cemeteries by order of General Thomas, commander of the Department of the Cumberland at Nashville, Murfreesboro & Chattanooga. At his order, there was no segregation of men by states or race.
By chance the 111th USCTI was guarding the stretch of N&CRR chosen for the site of Stones River National Cemetery. They were put under the command of army Chaplin William Earnshaw. Their mandate was to go out seventy miles & collect the remains of soldiers buried at hospital sites, skirmishes etc.
The accompanying photo is of section I, the southeast corner of the cemetery. It contains remains of the Union dead from Franklin.
After the battle the Union casualties had been later out in the ditch in front of the earthworks & the berm shoveled down over them. For reasons too convoluted to explain, by the time the 111th came to collect them, they had been moved three times.
As a result, almost all of the graves have square markers with numbers on them marking the graves of unknowns.
Unknown did not mean that the soldier's death was unrecorded. At what is now Central Magnet School in Murfreesboro (+/-) 300 remaines were collected from the site of a hospital.
When a soldier who died at a hospital was buried by his comrades, careful record of it was kept in a brigade cemetery.
"Mr. Sober,
Dear Sir,
I must write you the terrible news that Spencer is dead. He died at 3:00 in Hospital #8 in Murfreesboro. He was not well & should not have come here until the spring. We buried him at the brigade headquarters. He had the lung fever. I have his things & will express them when I can.
Yours, Orlando Demmic
When the 111th collected Spencer's remains, very careful tract was kept of the identification.
I can testify personally that a patient of a serious, life threatening injury injury arrives at the emergency room, in short order they are naked. The same was true of soldiers at the "almost twenty" hospitals in Murfreesboro. Record was kept of the soldier's death. Exactly which body was which in the often hasty trench burial was not a priority.
Sargent William Holland of the 111th USCTI's stone sits to the north of the Hazen Brigade Monument's southern wall. For decades it was the object of curiosity & speculation. Why was a lone USCT buried in such a place?
William Holland was captured by N. B. Forest. He was gifted gifted to the brigade surgeon. When Forrest's cavalry & Bate's infantry were sent to Murfreesboro after the Battle of Franklin, they suffered a route when the garrison of Fortress Rosecrans sallied. In the confusion following the Battle of the Cedars, Holland escaped.
By chance, his regiment was the very 111th that was guarding the RR when Chaplin Earnshaw came calling. After the war, Holland became the first head grounds keeper. He was buried in his own ground on the farm he owned adjacent to the Hazen Brigade Monument.
The Confederate Circle in Murfreesboro's Evergreen Cemetery tells a story of how the identity of soldier's remains were lost.
Following General Thomas' example, a committee of local ladies purchased a plot of ground & hired experienced veterans of the 111th to collect the remains of Confederates from the surrounding country.
As with the identified Union dead, careful tract was kept & the graves clearly marked.
When the Maney family opened the land next to the Oaklands Plantation unmarked slave cemetery after the war, local white families bought family plots. They often disinterred relatives & reburied the remains there.
In a saga of a group of men deciding to create a monumental burial, it was decided to remove the gathered Confederate dead to the new cemetery.
Much to their shock & surprise the ladies society that owned the land on which the collected Confederate dead were laid objected to the relocation. After a hoo-haa too convoluted to explain here, the men got their way.
However, the rate / grave quoted by surviving 111th veterans skilled in such work was too dear. To the collective & long remembered fury of the ladies, the cut rate workers made no attempt to keep tract of the identified remains.
As a result, (+/-) 2,000 Confederate dead share a mass grave. Later generations put up a marker listing the names of known internees.
For the first time, after the Battle of Chickamauga the Army of Tennessee held the ground on which the battle was fought. When Cumberlander's returned to the battlefield after Missionary Ridge & the route of Bragg's army they were shocked & outraged at what the discovered. Contrary to all military custom & prudent sanitation, their camaraderie bodies had been left were the lay. Wild animals & farmer's pigs had feasted on the bounty. What could be collected was eventually interred on Orchard Knob.
At the site of an existing cemetery containing the graves of Revolutionary War veterans, a local farmer reinterred the collected remains of Confederate soldiers.
15 miles southeast of Murfreesboro, Hoover's Gap / Beech Grove was the site of Wilder's Brigade's first use of repeating rifles in the defeat of Bates brigade on July 23rd 1863, the opening day of the Tullahoma Campaign.
The U.S. Sanitary Commission kept meticulous daily reports of soldiers in Union hospitals. When they died, it was the sanitarians who contacted families. Many of the deceased were embalmed & returned home burial. Those that were not at minimum had their deaths recorded & grave sites identified when possible.
The history of the soldiers buried at Stones River is very much a part of the narrative that rangers & living history volunteers keep alive. The 'Hallowed Ground Candlelight Tour' of Stones River National Battlefield' is one of the longest continuously run living history programs in the National Park Service.