By the summer of 1780 the southern war had become a disaster for the Patriots. Charleston had surrendered in May after a two-month siege. Three weeks later at Waxhaws, Banastre Tarleton's cavalry slaughtered Colonel Abraham Buford's surrendering Virginians and turned "Tarleton's quarter" into a Patriot war cry. With the Continental Army effectively gone from the Carolinas, Cornwallis planted Loyalist outposts across the interior to recruit, to overawe the countryside, and to choke off Patriot dissent. Rocky Mount - perched above the confluence of Rocky Creek and the Catawba River - was one of those outposts, garrisoned by the New York Volunteers under Lieutenant Colonel George Turnbull. The British thought South Carolina was conquered. They were about to learn otherwise.

Thomas Sumter began rebuilding from nothing. Through June and into July 1780, he assembled a militia force near Salisbury with backing from North Carolina's revolutionary government. Recruitment was slow until July 12, when Patriots routed a Loyalist force at Huck's Defeat and gave the backcountry something to believe in. Enlistments surged. By late July, Sumter had several hundred men under arms and a target picked out. On July 28, he broke camp and moved his column - now about six hundred strong - down to Land's Ford, a major Catawba crossing. There he met Major William Davie with a company of dragoons and a handful of smaller militia bands. The two officers split their attack: Davie would feint against the British outpost at Hanging Rock; Sumter would assault Rocky Mount itself.

Davie's part went perfectly. Riding into the outskirts of Hanging Rock at dawn on July 31, his dragoons surprised a company of Loyalists camped outside the fortifications, cut them up, and made off with sixty horses before the garrison inside could even mount a response. At Rocky Mount, things did not go so well. The defenses that Turnbull had quietly upgraded - logs, earth, loopholes - swallowed every Patriot bullet. Hours of close-range musketry produced nothing. With ammunition running low and the position holding, Sumter changed tactics: his men gathered brush and tried to burn the works down. They were getting somewhere when a torrential summer thunderstorm broke over the Catawba, soaking the kindling and ending the battle. Sumter pulled back.

By any conventional measure, Rocky Mount was a failure. Sumter's losses were modest but the British position had held. And yet the engagement told the British what they had refused to learn: the Carolina backcountry was not pacified. Within days Sumter was on the move again, and on August 6 his men overran the Loyalist outpost at Hanging Rock in a confused, day-long brawl that killed and wounded hundreds. The Catawba River line, which Cornwallis had counted on as a quiet rear area, was now an active front. Two months later, west of where Sumter and Turnbull had fought their indecisive duel, an army of overmountain riflemen would catch Patrick Ferguson on a wooded ridge called King's Mountain - and the war in the south would tip the other way.