Thank you, Steven. This is what my research says:
In 1776, the Ninety-Six District militia split into Loyalist and Patriot factions. Williams was made a lieutenant colonel of a regiment, but he had to recruit and train the new men. He succeeded in organizing a militia group, but pressure from Britain and her Indian allies meant that Williams always had to leave some troops behind for home defense. Williams led forces of local men into action at nearby Briar Creek and Stone Ferry, and as far afield as the expedition to the Second Battle of Savannah.
On August 19, 1780 he led his detachment into the Battle of Musgrove Mill. The Patriots' success there, even in such a limited engagement and coming so soon after the disaster of Camden, earned him a promotion to colonel.
On 7 October 1780 he was mortally wounded at the Battle of Kings Mountain and died the next day. The South Carolina Provincial Congress had promoted Williams to the rank of Brigadier General but he died before the commission could be delivered.
I guess James Williams was hardly an unusual name. The James Williams you described doesn't sound like my family member.
Colonel James Williams was the brother of my third great grandmother, Marya Williams Goodman. I guess that makes him my third great greatuncle -- doesn't sound quite right, does it?
Are you the same person who wrote the Civil War Sticker?