James A. Moss, Manual of Military Training
“ The recruit should be given careful instruction in the individual use of cover. (152) It should be impressed upon him that, in taking advantage of natural cover, he must be able to fire easily and effectively upon the enemy; if advancing on an enemy, he must do so steadily and as rapidly as possible; he must conceal himself as much as possible while firing and while advancing. While setting his sight he should be under cover or lying prone. ”
