I have a recording of Tina Liza Jones, of Floyd, VA, singing that song! I love it so much I wrote down her words. Here goes:

BOSTON BOY

He was just a blue eyed Boston boy. His voice was low with pain.
I'll do your bidding, comrade mine, if I ride back again.
But if you should ride and I am dead, would you do the same for me?
Mother, you know, must hear the news, so write to her tenderly.

She has lost all, one by one. Her husband and sons are gone.
I am all that she has left, but bravely she sent me on.
The other was tall, dark, handsome, and strong, but his faith in the world was slim.
He trusted only those he loved. They were all the world to him.

I have a girl in Boston town. Please write to her when I'm gone.
Tell her bravely of my death and tell her not to mourn.
Just then the order came to charge. For an instant hand touched hand.
They answered high and on they rode, that brave and devoted man.

[Break]

Straight was the course to the top of the hill, and the rebels they shot and shelled.
Black furls of death in the toiling ranks and garnered (?) them as they fell.
There soon was a horrible dying yell from heights they could not gauge,
And those whom doom and death had spared rode slowly down again.

But among the dead that were left on the hill was the boy with the curly hair.
The tall dark man who had bucked by his side lay dead beside him there.
There was none to write to the blue-eyed girl the words her lover had said.
And mother, you know, was awaiting her son. She'll only know he's dead.