Examples from the Web for grayback
Not a suspicion had yet been excited among my grayback companions.Four Years A Scout and Spy|E. C. Downs
My air-treading, toe-dancing “Grayback” of the morning was gone in the back and legs long before we reached the end.Down the Columbia|Lewis R. Freeman
"There's life there, Grayback," growled my attendant; and the Rebel ordered us to the rear.
Tom looked up, and discovered a grayback, standing on the shore, very deliberately pointing his musket at him.
He stepped back to one of the two windows on the front of the house, where he discovered an officer and two “grayback” soldiers.