 Thompson's Brigade surrendered on May 11, Confederate forces of North Georgia surrendered on May 12, and Kirby Smith surrendered on May 26 (officially signed June 2).The last battle of the American Civil War was the Battle of Palmito Ranch in Texas on May 12 and 13.The last significant Confederate active force to surrender was the Confederate allied Cherokee Brigadier General Stand Watie and his Indian soldiers on June 23.