Note 12 — Chapter II · HISTORIC.
Reading edition
Cañon du Chelly, in Arizona, on the Navajo Reservation, is a passage through a mountain range, twenty-five miles in length, from one hundred to five hundred yards in width, and is perhaps the strongest natural citadel on the earth. There is but one narrow way by which a horse can ascend its height, where a squad of soldiers could defy the cavalry of the world.