Defensive Obstacles
Just as modern military engineers enhance field fortifications with obstacles such as barbed wire, Medieval engineers used a number of obstacle types including abatis, caltrops, cheval de frise, and trou de loup.
Read more about this topic: Medieval Fortification
Famous quotes containing the words defensive and/or obstacles:
“Hats divide generally into three classes: offensive hats, defensive hats, and shrapnel.”
—Katharine Whitehorn (b. 1926)
“It is very rare that you meet with obstacles in this world which the humblest man has not faculties to surmount. It is true we may come to a perpendicular precipice, but we need not jump off, nor run our heads against it. A man may jump down his own cellar stairs, or dash his brains out against his chimney, if he is mad.”
—Henry David Thoreau (1817–1862)