Below is an excerpt from Wikipedia, which I found to be accurate. It is brief description of the last battle between troops in the East. The Thomas Legion was the only foce of significant size to counter Stoneman's Raid of plundering and pillaging during April of 1865. It is true, they captured a city in order to negotiate their own surrender.

Thomas' Legion was North Carolina's sole legion and was never actually defeated by Union troops. In May 1865, Union soldiers controlled Waynesville and the rest of Western North Carolina. On May 6, 1865, Thomas' Legion fired "The Last Shot" of the Civil War east of the Mississippi River in White Sulphur Springs, North Carolina. It had the distinction of capturing a city (Waynesville) then voluntarily ceasing from hostilities. In fact, the Legion was actually forced to capture the city in order to surrender.

Colonel Thomas and his men controlled the mountains surrounding Waynesville, and during the night built hundreds of campfires so it would appear to Union troops that thousands of Indians and Confederates were camped there. To ensure the right effect, the Cherokees punctuated the nights with “chilling warhoops” and “hideous yells.” The following morning Thomas and about 20 Cherokees entered Waynesville to demand the Yankees’ surrender. On May 9, 1865, after a Union officer stated that Lee had surrendered a month earlier and a Yankee surrender to Thomas would only bring in more Union troops, Colonel Thomas reluctantly agreed to lay down his arms. The Civil War was over, but the last shots in North Carolina had been fired in Waynesville.