Joseph A. Altsheler 
Guns of Bull Run A Story of the Civil War’s Eve [EPUB ebook] 

Excerpt: "It would soon be Christmas and Harry Kenton, at his desk in the Pendleton Academy, saw the snow falling heavily outside. The school stood on the skirt of the town, and the forest came down to the edge of the playing field. The great trees, oak and ash and elm, were clothed in white, and they stood out a vast and glittering tracery against the somber sky."