...e in Memphis. He was a son of Samuel P. Walker, and grand-nephew of the late President Polk. His age was not over twenty, if so much.--He was a Lieutenant, we think, in the regiment of his uncle, J. Knox Walker . The Captain of his company was shot early in the action. The young Lieutenant took command, led his company in the thickest of the battle, fighting and cheering gallantly for three hours at the ...