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Investment is the military process of surrounding an enemy fort (or town) with armed forces to prevent entry or escape. [1] [2] It serves both to cut communications with the outside world and to prevent supplies and reinforcements from being introduced.
A contravallation is a line of fortifications built by the attackers around the besieged fortification facing towards an enemy fort to protect the besiegers from sorties by its defenders and to enhance the blockade. [3] [4] The contravallation can be used as a base to launch assaults against the besieged city or to construct further earthworks nearer to the city.
A circumvallation may be constructed if the besieging army is threatened by a field army allied to an enemy fort. It is a second line of fortifications outside the contravallation that faces away from an enemy fort. The circumvallation protects the besiegers from attacks by allies of the city's defenders and enhances the blockade of an enemy fort by making it more difficult to smuggle in supplies. [5]
Lines of contravallation and circumvallation generally consist of earthen ramparts and entrenchments that encircle the besieged city.
Thucydides notes the role circumvallation played in the Sicilian Expedition and in the Spartan siege of Plataea during the initial stages of the Peloponnesian War in 429 BC.
Julius Caesar in his Commentaries on the Gallic War describes his textbook use of the circumvallation [6] to defeat the Gauls under their chieftain, Vercingetorix, at the Siege of Alesia in September 52 BC.
During the Siege of Jerusalem, Titus and his Roman legions built a circumvallation, cutting down all trees within fifteen kilometres (9 miles).
Another example from the pre-modern period is the Siege of Constantinople (717–718).
The caliph of the Umayyad Empire took advantage of the violent anarchy in the Byzantine Empire to prepare a huge host, comprising more than 100,000 troops and 1,800 ships, to take them to the Byzantine capital, Constantinople. Upon arriving outside the city's Theodosian walls, the Arab army had some knowledge that Emperor Leo III the Isaurian had allied with Bulgaria under Khan Tervel, and so, in preparation for the Bulgarian army, built a set of stone walls against the city and against the countryside, with the Arab camp in between. [7]
King Pepin the Short of Francia built a number of fortified camps during his Siege of Bourbon (761) to surround the town completely. [8] He built a complete set of lines of circumvallation and contravallation during the Siege of Bourges (762). [9]
The basic objectives and tactics of a military investment have remained the same in the modern era. During the Second World War, there were many sieges and many investments. One of the best-known sieges of the war, which demonstrated the tactical use of investment, was the Siege of Stalingrad. During the first half of the siege, the Germans were unable to fully encircle the city and so the Soviets got men and supplies in across the Volga River. During the second half of the battle, the complete investment of Stalingrad by the Soviets, including airspace, which prevented the construction by the Germans of an adequately large airbridge, eventually forced the starving Germans in the city to surrender.
In modern times, investments and sieges of cities are often combined with intensive shelling, air strikes and extensive use of land and/or sea mines.
A siege is a military blockade of a city, or fortress, with the intent of conquering by attrition, or by well-prepared assault. 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.
Vercingetorix was a Gallic king and chieftain of the Arverni tribe who united the Gauls in a failed revolt against Roman forces during the last phase of Julius Caesar's Gallic Wars. After surrendering to Caesar and spending almost six years in prison, he was executed in Rome.
The Battle of Dyrrachium took place from April to late July 48 BC near the city of Dyrrachium, modern day Durrës in what is now Albania. It was fought between Gaius Julius Caesar and an army led by Gnaeus Pompey during Caesar's civil war.
The Battle of Alesia or siege of Alesia was the climactic military engagement of the Gallic Wars, fought around the Gallic oppidum of Alesia in modern France, a major centre of the Mandubii tribe. It was fought by the Roman army of Julius Caesar against a confederation of Gallic tribes united under the leadership of Vercingetorix of the Arverni. It was the last major engagement between Gauls and Romans, and is considered one of Caesar's greatest military achievements and a classic example of siege warfare and investment; the Roman army built dual lines of fortifications—an inner wall to keep the besieged Gauls in, and an outer wall to keep the Gallic relief force out. The Battle of Alesia marked the end of Gallic independence in the modern day territory of France and Belgium.
Encirclement is a military term for the situation when a force or target is isolated and surrounded by enemy forces. The situation is highly dangerous for the encircled force. At the strategic level, it cannot receive supplies or reinforcements, and on the tactical level, the units in the force can be subject to an attack from several sides. Lastly, since the force cannot retreat, unless it is relieved or can break out, it must fight to the death or surrender.
A redoubt is a fort or fort system usually consisting of an enclosed defensive emplacement outside a larger fort, usually relying on earthworks, although some are constructed of stone or brick. It is meant to protect soldiers outside the main defensive line and can be a permanent structure or a hastily constructed temporary fortification. The word means "a place of retreat". Redoubts were a component of the military strategies of most European empires during the colonial era, especially in the outer works of Vauban-style fortresses made popular during the 17th century, although the concept of redoubts has existed since medieval times. A redoubt differs from a redan in that the redan is open in the rear, whereas the redoubt was considered an enclosed work.
Druids is a 2001 epic historical drama film directed by Jacques Dorfmann. It stars Christopher Lambert, Klaus Maria Brandauer, Inés Sastre, Maria Kavardjikova, Bernard-Pierre Donnadieu, and Max von Sydow.
Vallum is either the whole or a portion of the fortifications of a Roman camp. The vallum usually comprised an earthen or turf rampart (Agger) with a wooden palisade on top, with a deep outer ditch (fossa). The name is derived from vallus, and properly means the palisade which ran along the outer edge of the top of the agger, but is usually used to refer to the whole fortification.
Alesia was the capital of the Mandubii, one of the Gallic tribes allied with the Aedui. The Celtic oppidum was conquered by Julius Caesar during the Gallic Wars and afterwards became a Gallo-Roman town. Modern understanding of its location was controversial for a long time; however, it is now thought to have been located on Mont-Auxois, near Alise-Sainte-Reine in Burgundy, France.
The siege of Maastricht was fought between 9 June and 22 August 1632, when the Dutch commander Frederick Henry, Prince of Orange, eventually captured the city from Habsburg forces.
Romanmilitary engineering was of a scale and frequency far beyond that of its contemporaries. Indeed, military engineering was in many ways endemic in Roman military culture, as demonstrated by each Roman legionary having as part of his equipment a shovel, alongside his gladius (sword) and pila (spears).
Lucius Aurunculeius Cotta was an officer in the Gallic army of Gaius Julius Caesar. The little we know of Cotta is found in Book V of Caesar's De Bello Gallico. In 54 BC, when Caesar returned to Gaul from his second expedition to Britain, he found food in short supply. He therefore spread out his eight legions amongst a larger number of Gallic states from which to draw their sustenance during the winter. To the eighth legion, which had recently been raised from across the Po he added another five cohorts, appointing Quintus Titurius Sabinus and Lucius Aurunculeius Cotta as the legati commanding them.
The siege of Luxembourg, in which Louis XIV of France laid siege to the Spanish-controlled Fortress of Luxembourg from 27 April to 7 June 1684, was the most significant confrontation of the War of the Reunions between France and Spain. The action caused alarm among France's neighbours and resulted in the formation of the League of Augsburg in 1686. In the ensuing war France was forced to give up the duchy, which was returned to the Habsburgs by the Treaty of Ryswick in 1697.
Sapping is a term used in siege operations to describe the digging of a covered trench to approach a besieged place without danger from the enemy's fire. The purpose of the sap is usually to advance a besieging army's position towards an attacked fortification. It is excavated by specialised military units, whose members are often called sappers.
The siege of Grol in 1627 was a battle between the Army of the Dutch Republic, commanded by Frederick Henry, Prince of Orange, and the Spanish-controlled fortified city of Grol, during the Eighty Years War and the Anglo–Spanish War in 1627. The Spanish Army, led by Hendrik van den Bergh, came to relieve Grol but too late. The siege lasted from 20 July until 19 August 1627, resulting in the surrender of the city to the Dutch army.
The fourth siege of Breda was an important siege in the Eighty Years' War in which stadtholder Frederick Henry, Prince of Orange retook the city of Breda, which had last changed hands in 1625 when the Spanish general Ambrogio Spinola conquered it for the Spanish Habsburgs. Hereafter, the city would remain in the hands of the Dutch Republic until the end of the war.
The siege of Uxellodunum was one of the last battles of the Gallic Wars. It took place in 51 BC at Uxellodunum. It was the last major military confrontation of the Gallic Wars and marked the pacification of Gaul under Roman rule. The battle resulted in a decisive Roman victory.
The siege of Bourges was a Frankish siege of the Aquitanian fortress town of Bourges in 762 during the Aquitanian War. The Frankish army under King Pepin the Short invested the fort with lines of circumvallation, contravallation and siege engines. The walls were breached and the fort taken. Count Chunibert of Bourges swore his loyalty to Pepin along with his Gascon levies and their families. Pepin appointed several counts of his own to garrison the place and the Frankish army went on to besiege Thouars.
Siege in ancient Rome was one of the techniques used by the Roman army to achieve ultimate victory, although pitched battles were considered the only true form of warfare. Nevertheless, the importance that siege action could have in the warfare framework of that era cannot be underestimated. Hannibal was unable to defeat the might of Rome because, although he had defeated the Roman armies in the open field, he had proved unable to assault the city of Rome. As time went on, the armies of the late Roman and Imperial Republics also became particularly adept at siege warfare: Gaius Julius Caesar's conquest of Gaul was the combination of a whole series of pitched battles and long sieges, culminating in that of Alesia in 52 BCE. To seize the main center of an enemy people seemed to be the best way to bring a conflict to an end, as also happened in the time of Trajan, during the conquest of Dacia, when the enemy capital, Sarmizegetusa Regia, was besieged and occupied. For this purpose, numerous works and siege machines were, therefore, required for variety and functionality, engaging soldiers in the execution of important military engineering works.
Gnaeus Domitius Corbulo used to say that the enemy was won with the hoe, that is, with construction works.
If an attempt at relief from without was to be feared, another line of works must be created, outside the first, and facing outwards. In modern warfare this latter line is called the circumvallation, and the inner one the contravallation.