H. W. Halleck,
Elements of Military Art and Science
“ This corps should be composed chiefly of light troops—cavalry, light infantry, horse artillery, "brigades of engineers and mounted sappers,"—who march in advance of the besieging army, and, by a sudden movement, surround the work, seize upon all the avenues of approach, and carry off every thing without the work that can be of service either to the garrison or to the besiegers. ”
