I see correspondence from Stephen Mayfield, his father.
Here we find the Stephen Mayfield family enumerated in the 1860 US census at Conyers, Newton County, Georgia. William Newton is enumerated as age 20 and born in Georgia. The census was recorded July 17, 1860 so Wm Newton was most likely born in 1840 and was 22 years old at the time of his death.
The affidavit signed by Stephen Mayfield, father of William Newton Mayfield, deceased, says that William died from wounds received in the service of the Confederate States on or about October 13, 1862. His death occurred on or about October 13 - not the wounds. The wound was received September 14, 1862.
In 1862, Cobb's Legion was part of Howell Cobb's brigade. At that point, the brigade consisted of the 16th Georgia, Cobb'sLegion, 24th Georgia, and 15th North Carolina. They were slaughtered September 14, 1862 in the Battle of Crampton's Gap on the face of South Mountain, near Burkittsville, MD - overrun and all but surrounded. It was pretty much a rout and the survivors escaped every man for himself.
This article below entitled "Names of Confederate Soldiers Who Died at Burketsville [sic]" published in
Southern Confederacy. (Atlanta, GA), November 08, 1862, 2 tells us that "Corp Mayfield" of Cobb's Legion died at the hospital at Burkittsville. We can surmise that Corporal Mayfield was mortally wounded September 14, 1862 in the Battle of Crampton's Gap. He was left on the mountainside, captured by the Federals, removed down the slope to Burkittsville, treated at one of the makeshift field hospitals (there were 3) where he died.
Although our informant Philip T Brown of the 12th VA specifies the exact death date for others who died at Burkittsville, he does not list Mayfield's death date. We can surmise that Mayfield's family was notified of his death though, because father Stephen Mayfield says it occurred "on or about October 13, 1862." Although one other document in the file says he died October 15, 1862, all other documents agree it was Oct. 13 and father Stephen says Oct 13. That's a pretty specific date, not anywhere near the date Wm was originally wounded. So the 22 year old survived nearly a month with what was most likely a minie ball that shattered the bone in his leg. And when his father filed for his backpack, the family received $83.
If you'd like to get a sense of what the situation was like for your relative, here's a thread that details the experience of a couple of other members of Cobb's Legion at Crampton's Gap -- Benjamin Mell (mortally wounded; died Oct 20) and Sgt Henry Clay Brown who survived (post 15 in the thread). It also includes information about the Burkittsville field hospitals. Please exercise caution - it paints a pretty vivid scene.
"It is my painful task to announce to you the death of your brave and interesting son, Benjamin Mell. You have perhaps heard that he was wounded in the battle of Crampton Gap, which was fought on the 14th of September, on a mountain pass...." Sgt. Benjamin Mell, Company D, Cobb's Legion was...
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Southern Confederacy. (Atlanta, GA), November 08, 1862, 2.