Defenses have been constructed for thousands of year. Bronze and Iron Age hillforts took advantage of natural hills for defense purpose and the Romans built the Saxon Forts along the southeast coast of British to dater invasion. The Invention of Fort
The word fort is derived from the Latin fortis meaning strong and many military installations are known as forts. The tern fortification also refers to improving other defenses such as city walls. The permanent fortification was needed little preparation using earth timber or sandbags.
The arrival of cannons in the fourteen century made medieval fortification obsolete. Later constructions included ditches and earth ramparts to absorb the energy of cannon fire.
Explosive shells in the Nineteenth century led to a further evolution; the profile of the fort became lower surrounded by an open sloping area that eliminated cover for the enemy. The fort’s entry point was a gatehouse in the inner face of the ditch with across via bridge that could be withdrawn.
Most of the fort was built underground, with passages connecting blockhouse and firing points. Guns mounted in open emplacements were produced by heavy parapets.
Offensive and defensive tactics became focused on mobility. In the twentieth century defending tanks were concentrated in mobile units behind the line. If an offensive was launched reinforcements could be sent to that area.
The reinforced concrete fortification was cannon during the nineteenth and early twentieth centuries but modern warfare has made large-scale fortification obsolete; Now only deep underground bunkers provide sufficient protection. Today forts mostly survive as the popular tourist destination.
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