The skirmishes begin, they crawl     cautiously ahead, I hear the
    irregulars snap! snap!
I hear the sounds of the different
    missles, the short t-h-t! t-h-t! of the     rifle balls,
I see the shells exploding leaving small     white clouds, I hear the great shells     shrieking as they pass

(The Artilleryman's Vision 450)
LC-DIG-cwpb-01109
Antietam, Maryland