Chickamauga

From the text:

In his younger manhood the father had been a soldier, had fought against naked savages and followed the flag of his country into the capital of a civilized race to the far South. In the peaceful life of a planter the warrior-fire survived; once kindled, it is never extinguished. The man loved military books and pictures and the boy had understood enough to make himself a wooden sword, though even the eye of his father would hardly have known it for what it was.