My GGG grandfather served both the confederacy and union.

[Spider Jerusalem]

10. I have ancestors on both sides of that conflict

One of my great-great-great-grandfathers lived in Washington, DC, and he enlisted in the 6th Battalion of the District of Columbia Infantry three days after Fort Sumter and served for three months (this was at the beginning of the war when everyone thought it would be over quickly, and the urgent need at the time was a defense force for DC in case Maryland ended up seceding and the capitol was suddenly deep in enemy territory). Another, in Graves County, Kentucky, enlisted in the 15th Regiment of Kentucky Cavalry (Union) for one year, from 1862-1863 (this ancestor's father owned slaves; he's on the 1850 census slave schedule with 5 slaves, and none in 1860).

On the other side, I have a g-g-g-grandfather who lived in Georgia, right in the line of Sherman's march to the sea. He didn't own slaves and was past military age (46), but he enlisted in a militia regiment in the late spring of 1864.

I have other ancestors who owned slaves in 1860; one was in Union County, Kentucky, and too old for military service, the other was in Georgia, was pastor of a Baptist church, and was also too old for military service (several of his sons fought for the Confederacy, and one was killed at Petersburg in 1864).