Fortification, Military Science & History of Defense Structures

Fortification, in military science, any work erected to strengthen a position against attack. Fortifications are usually of two types: permanent and field. Permanent fortifications include elaborate forts and troop shelters and are most often erected in times of peace or upon threat of war. Field

Fortification, Military Wiki

Fortification - Simple English Wikipedia, the free encyclopedia

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Fortification - Wikipedia

Fortification, Military Science & History of Defense Structures

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