Abatis, Abattis or Abbattis (a French word meaning a heap of material thrown), a term in field fortification for an obstacle formed of the branches of trees laid in a row, with the tops directed towards the enemy and interlaced or tied with wire. The abatis is used alone or in combination with wire entanglements and other obstacles. ...more on Wikipedia about "Abatis"
Anadoluhisari is a castle in Istanbul Strait, Bosporus. In English it is called Anatolian Castle. It was built in 1393 by the Ottoman emperor Bayezid "The Thunderbolt" in order to prepare to lay siege at Constantinople (the area between the Golden Horn and the Sea of Marmara of today's Istanbul). ...more on Wikipedia about "Anadoluhisari"
The Anastasian Wall ( Turkish: Anastasius Suru) or the Long Walls of Thrace (Uzun Duvar) is an ancient, stone and turf fortification located 65 km west of Istanbul, Turkey built by the Byzantines during the late 5th century. Originally some 56 km long, it stretches from Evcik İskelesi at the Black Sea coast across the Thracian peninsula to the coast of the Sea of Marmara at 6 km west of Silivri (ancient Selymbria). The wall was part of an additional outer defense system for Constantinople, capital of the Eastern Roman Empire and probably continued in use until the 7th century. ...more on Wikipedia about "Anastasian Wall"
The Antonine Wall is a stone and turf fortification, built by the Romans across what is now the central belt of Scotland. ...more on Wikipedia about "Antonine Wall"
Area denial weapons are used to prevent an adversary from occupying or traversing an area of land. The most common are land mines of various types. ...more on Wikipedia about "Area denial weapons"
An arrow slit is a thin vertical window in a fortification through which an archer can shoot arrows while remaining largely free from personal danger. ...more on Wikipedia about "Arrow slit"
The Atlantic Wall ( Gr Atlantikwall) was an extensive system of coastal fortifications built by the German Third Reich during the Second World War along the western coast of Europe (1942-44) in order to defend against an anticipated Anglo-American invasion of the continent from Great Britain. ...more on Wikipedia about "Atlantic Wall"
The Babruysk Fortress is a historic fortress in the city of Babruysk, Belarus that was built between 1810 and 1836. It is one of the best surviving examples of fortification architecture and design in the first half of the 19th century. The fortress was constructed in the historic center of the city, at the confluence of the Babruyka and Berezina rivers. That was one of the western Russian fortresses. ...more on Wikipedia about "Babruysk fortress"
Barbican (from mediæval Latin barbecana) - a fortified outpost or gateway, such as an outer defence to a city or castle and any tower situated over a gate or bridge which was used for defence purposes. Usually barbicans were situated outside the main line of defences and connected to the city walls with a walled road called the neck. ...more on Wikipedia about "Barbican"
A bartizan is an overhanging, wall-mounted turret projecting from the walls of ancient fortifications. ...more on Wikipedia about "Bartizan"
A bastion is a fortification work projecting outward from the main inclosure of a fortification, situated in both corners of a straight wall (termed curtain), with the shape of a sharp point, facilitating active defence against assaulting troops. It allows the defenders of the fort to cover adjacent bastions and curtains with defensive fire. ...more on Wikipedia about "Bastion"
Bastle houses are found along the Anglo- Scottish border, in the areas formerly plagued by border Reivers. They are farmhouses, characterized by extremely tight measures taken against raids. Their name is said to derive from the French word " bastille." ...more on Wikipedia about "Bastle house"
A battlement, (also called a crenellation) in defensive architecture such as that of city walls or castles, comprises a parapet (i.e. a short wall), in which portions have been cut out at intervals to allow the discharge of arrows or other missiles. These cut-out portions form crenels (also known as carnels, embrasures, loops or wheelers). The solid widths between the crenels are called merlons (also called cops or kneelers). Battlements often have openings between the supporting corbels, through which stones or burning objects could be dropped on attackers; these are known as machicolations. A wall with battlements is said to be crenellated or embattled. ...more on Wikipedia about "Battlement"
Bawn is the anglicized version of the Gaelic word badhun meaning cattle-fort. It is a defensive wall built around a tower house. It gets its name because it was used to protect livestock during an attack. ...more on Wikipedia about "Bawn"
The city wall of Beijing was a fortification built around 1435. It was 23.5 km long. The thickness at ground level ...more on Wikipedia about "Beijing city wall"
A berm is a level space or shelf separating two features. ...more on Wikipedia about "Berm"
A blast pen was a specially-constructed E-shaped double bay at British RAF World War 2 fighter stations, being either 150 feet or 190 feet wide and 80 feet front-to-back, accommodating aircraft for safe-keeping against bomb blasts and splinters during enemy air-attacks. ...more on Wikipedia about "Blast pen"
A blast shelter is a place where people can go to protect themselves from bomb blasts. It differs from a fallout shelter, in that its main purpose is to protect from shock waves and overpressure, instead of from radiation - laden precipitation, as a fallout shelter does. It is also possible for a shelter to protect from both blast and fallout. ...more on Wikipedia about "Blast shelter"
In military science, a blockhouse is a small, isolated fort in the form of a single building. Originally blockhouses were constructed as part of a large plan, to "block" access to vital points in the scheme. But from the Age of Exploration to the nineteenth century standard patterns of blockhouses were constructed for defence in frontier areas, particularly South Africa, New Zealand, Canada, and the United States. ...more on Wikipedia about "Blockhouse"
Brest-Litovsk Fortress is the biggest 19th century fortresses of Russian Empire, one of the western Russian fortresses. It is located at the confluence of the Mukhavets river and the Bug river with total area 4 km². ...more on Wikipedia about "Brest-Litovsk fortress"
A bunker is a defensive warfare fortification to protect personnel or equipment. ...more on Wikipedia about "Bunker" My www.shortopedia.com and me. Fortification
A caltrop (jack rock, star nail) is a weapon made up of four (or more) sharp nails or spines arranged in such a manner that one of them always points upward from a stable base (for example, a tetrahedron or tetrapod). Caltrops serve to slow down the advance of horses, war elephants, and human troops. It was said to be particularly effective against the soft feet of camels ** . In more modern times, caltrops could be effective against wheeled vehicles. In Japan such devices were known as Makibishi. ...more on Wikipedia about "Caltrop"
A canyon, or gorge, is a valley walled by cliffs. In fortification a gorge is the rear entrance or part of a bastion or similar outwork. ...more on Wikipedia about "Canyon"
A Caponier is a type of fortification structure. ...more on Wikipedia about "Caponier"
A casemate is a heavy duty structure originally a vaulted chamber in a fortress. Today the military use the term for a fortified gun emplacement. In civilian use a casemate may be a tunnel cut into a rock face with armoured doors, used for storing volatile goods. ...more on Wikipedia about "Casemate" Things go better with shortopedia. Fortification
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