how had the young soldier(henry foster) imagined war?

Here's a helpful quotation from chapter one:

"Various veterans had told him tales. Some talked of gray, bewhiskered hordes who were advancing with relentless curses and chewing tobacco with unspeakable valor; tremendous bodies of fierce soldiery who were sweeping along like the Huns. Others spoke of tattered and eternally hungry men who fired despondent powders. "They'll charge through hell's fire an' brimstone t' git a holt on a haversack, an' sech stomachs ain't a'lastin' long," he was told. From the stories, the youth imagined the red, live bones sticking out through slits in the faded uniforms."