Aaron Pinson (Lydia Burch Allen's uncle) had land in Section 13 acquired in the original 1820 land sale of Indian lands in Macon (Macon not actually formed until 1828 from Haywood).The southern border of that Section was the Ga. Border.
The Pinson land in Wolffork Valley of Rabun Co. was looked down on by Pinson Mtn. (Penson knob) thought to be named for Aaron's father Joseph.Supposedly a Mtn in Macon was named after Aaron Pinson.But it appeared they were the same long Mountain ridge extending into two states!!Need to get a topo map someday to check that out.
Three sisters of Aaron Pinson (Mary, Emelia and Sarah) married three sons of Judge Henry and Susannah Burch (John, Jarrett and Reuben).All three of these couples apparently had sons named Joseph, although Reuben and his family were off in Benton Co. Alabama.The other two stayed in North Ga. as far as I know.So, it was probably his uncle (Lydia's brother) who married Thompson Allen.
By the way, I found a couple of Thompson's brothers (per conformation of a descendent) in 1860 Polk Tenn. by Enoch J. Nicholson and his wife Louissa McNabb.Louissa was the half sister of their brother Jarrett Erslie Allen's wife Lucretia McNabb.Enoch was related (cousin or Nephew?)to Rachel Nicholson Pinson a daughter in law of Judge Aaron Pinson of Gilmer Co.
North Georgia Counties were not for secession.In fact, Georgia nearly didn't secede.But the men went along once Georgia seceded.By the end of the war, many north Georgians and Alabaman's had changed their allegiance.In some ways, these Northern mountainous counties had more in common with many northern areas than with parts of their own states.The small mountain valley farms didn't support a large slave population and the farms weren't pure cotton producers, but were more diversified in crops and animals.