Nathanael Greene was a Quaker blacksmith's son from Rhode Island who taught himself military strategy by reading books. When the Revolution began, he enlisted as a private and rose to Major General within a year. By 1780, the British had captured Charleston, crushed the Continental Army in the Carolinas, and the Southern campaign was in collapse. Washington sent Greene to take command of what was left.
Greene never won a single major battle in the South. He lost most of them. But he understood something his opponents didn't: you win a war of attrition by surviving, not by winning. Every engagement cost the British more than they could afford, in men, supplies, and morale. By 1781, British General Cornwallis gave up on the Carolinas entirely and marched north to Virginia, where he met Washington at Yorktown. Greene had pushed him there.
He died at 44, just four years after the war ended, from a sunstroke on his Georgia plantation. He never got the fame of the generals who fought in the North, never had his face on currency. But the Southern states knew what he had done. Georgia gave him a plantation in gratitude. It wasn't enough, but it was something. The country that exists today exists in part because Nathanael Greene was willing to lose, and lose, and keep going.