Barrel Roll Offensive

From Turtledove

The Barrel Roll Offensive was a major US offensive in Tennessee led by George Armstrong Custer on Remembrance Day, April 22, 1917. The attack plan called for using massive numbers of barrels, over 300 of them, as a way to crush the Confederate trenches and break through to the open area beyond the line. The attack was carried out in secrecy between Custer and several chosen members of his staff, including Abner Dowling and its field commander, Irving Morrell, because the attack violated US General Staff barrel policy. The offensive was the first of a set of battles that ultimately led to US victory in North America against the Confederacy and its Canadian ally.