John: My records show that William, Seth, John and John, Jr. signed the famous Darien Committee Report. In that it sends Lyman Hall and Button Gwinett as delegates from the Colony of Georgia, to the Continental Congress, held in Philidelphia. They were signers of the Declaration of Independence. The McCulloughs were very active in the coastal areas of Georgia (Midway, Sunbury and Darien).
My notes say that William McCullough must have spent most of his time in South Carolina. In 1777, 1778 all of the McCulloughs as well as most of the inhabitants of the Midway area left for South Carolina and and peaceful areas of Georgia. This action was due to the Revolutionary War with the British attacking this area. The McCulloughs went back to their old homes in South Carolina and after the War returned to Midway, Georgia.
I also show this William McCullough as Corporal, 9th Company, Marions Brigade, Revolutionary soldier. Present at the storming of Charleston, S.C. in 1779 and at the recapture in the 1780's. His wife was Margaret. They had one daughter named Margaret, born 7/7/1791 and she married a Orin Dudley in 1809. John McCullough, Sr. will mentions son William in "Deed Book DD P 317, records Craven County, S.C. William is also mention for Rev. War service in the Stub Indents and in Midway, Georgia Church records 1775 and beyond. William is also shown on the Harvey List as William McCullough, Son of Liberty.
Also Ive found where our ancestor James McCullough married Elizabeth Findley and one of their children was a child, William McCullough born 5/7/1798, D 1798. Keep on looking, Lee.