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A defense line or fortification line is a geographically recognizable line of troops and armament, fortified and set up to protect a high-value location or defend territory.
A defense line may be based on natural difficult terrain features, such as rivers or marshes, mountain ranges, or coastlines; temporary field fortification works such as trenches; and/or more permanent fortifications such as fortresses and bunkers.
Some notable defense lines include:
A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or by well-prepared assault. This derives from Latin: sedere, lit. 'to sit'. Siege warfare is a form of constant, low-intensity conflict characterized by one party holding a strong, static, defensive position. Consequently, an opportunity for negotiation between combatants is common, as proximity and fluctuating advantage can encourage diplomacy.
A defensive wall is a fortification usually used to protect a city, town or other settlement from potential aggressors. The walls can range from simple palisades or earthworks to extensive military fortifications with towers, bastions and gates for access to the city. From ancient to modern times, they were used to enclose settlements. Generally, these are referred to as city walls or town walls, although there were also walls, such as the Great Wall of China, Walls of Benin, Hadrian's Wall, Anastasian Wall, and the Atlantic Wall, which extended far beyond the borders of a city and were used to enclose regions or mark territorial boundaries. In mountainous terrain, defensive walls such as letzis were used in combination with castles to seal valleys from potential attack. Beyond their defensive utility, many walls also had important symbolic functions – representing the status and independence of the communities they embraced.
The Winter Line was a series of German and Italian military fortifications in Italy, constructed during World War II by Organisation Todt and commanded by Albert Kesselring. The series of three lines was designed to defend a western section of Italy, focused around the town of Monte Cassino, through which ran the important Highway 6 which led uninterrupted to Rome. The primary Gustav Line ran across Italy from just north of where the Garigliano River flows into the Tyrrhenian Sea in the west, through the Apennine Mountains to the mouth of the Sangro River on the Adriatic coast in the east. The two subsidiary lines, the Bernhardt Line and the Hitler Line, ran much shorter distances from the Tyrrehnian Sea to just northeast of Cassino where they would merge into the Gustav Line. Relative to the Gustav Line, the Hitler Line stood to the northwest and the Bernhardt Line to the southeast of the primary defenses.
A fortification is a military construction designed for the defense of territories in warfare, and is used to establish rule in a region during peacetime. The term is derived from Latin fortis ("strong") and facere.
Przemyśl is a city in southeastern Poland with 58,721 inhabitants, as of December 2021. In 1999, it became part of the Subcarpathian Voivodeship; it was previously the capital of Przemyśl Voivodeship.
A national redoubt or national fortress is an area to which the (remnant) military forces of a nation can be withdrawn if the main battle has been lost or even earlier if defeat is considered inevitable. Typically, a region is chosen with a geography favouring defence, such as a mountainous area or a peninsula, to function as a final holdout to preserve national independence and host an effective resistance movement for the duration of the conflict.
Zasechnaya cherta was a chain of fortification lines, created by Grand Duchy of Moscow and later the Tsardom of Russia to protect it from the Crimean-Nogai Raids that ravaged the southern provinces of the country via the Muravsky Trail during the Russo-Crimean Wars. It was south of the original line along the Oka River. It also served as a border between the Muscovite State and the steppe nomads. As a fortification line stretching for hundreds of kilometers, the Great Abatis Border is analogous to the Great Wall of China and the Roman limes.
An esplanade or promenade is a long, open, level area, usually next to a river or large body of water, where people may walk. The historical definition of esplanade was a large, open, level area outside fortress or city walls to provide clear fields of fire for the fortress's guns. In modern usage, the space allows the area to be paved as a pedestrian walk; esplanades are often on sea fronts and allow walking whatever the state of the tide, without having to walk on the beach.
Fortress Europe was a military propaganda term used by both sides of the Second World War which referred to the areas of Continental Europe occupied by Nazi Germany, as opposed to the United Kingdom across the Channel.
The Western Russian fortresses are a system of fortifications built by the Russian Empire in Eastern Europe in the early 19th century. The fortifications were constructed in three chains at strategic locations along Russia's western border, primarily to combat the threat of Prussia and Austria-Hungary, and to establish Russian rule in new western territories. By the late 19th century the fortifications were obsolete and the system became defunct by the collapse of the Russian Empire in 1917.
Dragon's teeth are pyramidal anti-tank obstacles of reinforced concrete first used during the Second World War to impede the movement of tanks and mechanised infantry. The idea was to slow down and channel tanks into killing zones where they could easily be disposed of by anti-tank weapons.
A naval ensign is an ensign used by naval ships of various countries to denote their nationality. It can be the same or different from a country's civil ensign or state ensign.
The Fortress of Van is a massive stone fortification built by the ancient kingdom of Urartu during the 9th to 7th centuries BC, and is the largest example of its kind. It overlooks the ruins of Tushpa, the ancient Urartian capital during the 9th century, which was centered upon the steep-sided bluff where the fortress now sits. A number of similar fortifications were built throughout the Urartian kingdom, usually cut into hillsides and outcrops in places where modern-day Armenia, Turkey and Iran meet. Successive groups such as the Medes, Achaemenids, Armenians, Parthians, Romans, Sassanid Persians, Byzantines, Arabs, Seljuks, Safavids, Afsharids, Ottomans and Russians each controlled the fortress at one time or another. The ancient fortress is located just west of Van and east of Lake Van in the Van Province of Turkey.
The military history of the United Kingdom covers the period from the creation of the united Kingdom of Great Britain, with the political union of England and Scotland in 1707, to the present day.
A field force in British and Indian Army military parlance is a combined arms land force operating under actual or assumed combat circumstances, usually for the length of a specific military campaign. It is used by other nations, but can have a different meaning.
Military aircraft insignia are insignia applied to military aircraft to identify the nation or branch of military service to which the aircraft belong. Many insignia are in the form of a circular roundel or modified roundel; other shapes such as stars, crosses, squares, or triangles are also used. Insignia are often displayed on the sides of the fuselage, the upper and lower surfaces of the wings, as well as on the fin or rudder of an aircraft, although considerable variation can be found amongst different air arms and within specific air arms over time.
Coastal defenceand coastal fortification are measures taken to provide protection against military attack at or near a coastline, for example, fortifications and coastal artillery. Because an invading enemy normally requires a port or harbour to sustain operations, such defences are usually concentrated around such facilities, or places where such facilities could be constructed. Coastal artillery fortifications generally followed the development of land fortifications, usually incorporating land defences; sometimes separate land defence forts were built to protect coastal forts. Through the middle 19th century, coastal forts could be bastion forts, star forts, polygonal forts, or sea forts, the first three types often with detached gun batteries called "water batteries". Coastal defence weapons throughout history were heavy naval guns or weapons based on them, often supplemented by lighter weapons. In the late 19th century separate batteries of coastal artillery replaced forts in some countries; in some areas these became widely separated geographically through the mid-20th century as weapon ranges increased. The amount of landward defence provided began to vary by country from the late 19th century; by 1900 new US forts almost totally neglected these defences. Booms were also usually part of a protected harbor's defences. In the middle 19th century underwater minefields and later controlled mines were often used, or stored in peacetime to be available in wartime. With the rise of the submarine threat at the beginning of the 20th century, anti-submarine nets were used extensively, usually added to boom defences, with major warships often being equipped with them through early World War I. In World War I railway artillery emerged and soon became part of coastal artillery in some countries; with railway artillery in coast defence some type of revolving mount had to be provided to allow tracking of fast-moving targets.
A polygonal fort is a type of fortification originating in France in the late 18th century and fully developed in Germany in the first half of the 19th century. Unlike earlier forts, polygonal forts had no bastions, which had proved to be vulnerable. As part of ring fortresses, polygonal forts were generally arranged in a ring around the place they were intended to protect, so that each fort could support its neighbours. The concept of the polygonal fort proved to be adaptable to improvements in the artillery which might be used against them, and they continued to be built and rebuilt well into the 20th century.
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