Fortress America:

From the earliest colonial settlements to recent Cold War bunkers, the North American continent has been home to thousands of forts and fortress structures. Seacoast forts were the nation's primary means of strategic defense from the 1790s until World War II. Almost every seaport on both coasts had at least one fort to protect it at one time or another. Inland forts were built to defend against attacks by Native Americans, or to defend against the English, the French, or the Spanish. So many forts were built-most in the 1800s-that there are few places in the continental United States more than fifty miles from a fort location. Yet, despite their prominence and importance, there has never been-until now-a single volume devoted to American forts and homeland fortification defense.As in their previous and very successful books, experts J. E. and H. W. Kaufmann include never-before-published photographs, extraordinary drawings, cut-aways, and diagrams to illustrate Fortress America.