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116-502: Gamleborg , also known as Gamleborg Viking Fortress , was the first fortification on the Danish island of Bornholm . Built around 750 AD, it was the seat of the kings of Bornholm during the Viking age (750–1050) and early Middle Ages (1050–1150). The massive fortress is 264 metres (866 ft) long from north to south and 110 metres (360 ft) wide from east to west, with gates to

232-512: A constitutional crisis . This crisis and the civil wars which followed brought an end to the Republic and led to the foundation of the Empire under Augustus in 27 BC. Generals, during the recent Republican civil wars, had formed their own legions and numbered them as they wished. During this time, there was a high incidence of Gemina (twin) legions, where two legions were consolidated into

348-430: A ravelin like angular gun platform screening one of the curtain walls which is protected from flanking fire from the towers of the main part of the fort. Another example is the fortifications of Rhodes which were frozen in 1522 so that Rhodes is the only European walled town that still shows the transition between the classical medieval fortification and the modern ones. A manual about the construction of fortification

464-410: A Roman legion. This was later changed to nine cohorts of standard size (with six centuries at 80 men each) with the first cohort being of double strength (five double-strength centuries with 160 men each). By the fourth century AD, the legion was a much smaller unit of about 1,000 to 1,500 men, and there were more of them. This had come about as the large formation legion and auxiliary unit, 10,000 men,

580-591: A crushing defeat at the Battle of the Allia , in 387 BC the military structure was reformed. Under the Camillan system the legions were initially structured based on social class, with the poorest being the first line of the formation. The legionaries most often fought with hastae (spears) and scuta (large rectangular shields) in a checkered maniple formation with assistance from skirmishers. The exception to this

696-521: A double wall of trenches and ramparts, and in the Congo forests concealed ditches and paths, along with the main works, often bristled with rows of sharpened stakes. Inner defenses were laid out to blunt an enemy penetration with a maze of defensive walls allowing for entrapment and crossfire on opposing forces. A military tactic of the Ashanti was to create powerful log stockades at key points. This

812-399: A legion was known as the primus pilus ( lit. "first maniple " ), who directly commanded the first century of the first cohort and commanded the whole first cohort when in battle. Within the second to tenth cohorts, the commander of each cohort's first century was known as a pilus prior and was in command of his entire cohort when in battle. The seniority of the pilus prior centurions

928-482: A military career; they were not paid well, their primary form of income being what they could loot from the battlefield, and were simply called upon when needed and returned to their civilian lives when they were no longer required. In terms of organization and function, the early Republican era military was inherited from the Etruscans and seemingly influenced by the ancient Greek and Macedonian phalanx . After

1044-413: A necessity for many cities. Amnya Fort in western Siberia has been described by archaeologists as one of the oldest known fortified settlements, as well as the northernmost Stone Age fort. In Bulgaria, near the town of Provadia a walled fortified settlement today called Solnitsata starting from 4700 BC had a diameter of about 300 feet (91 m), was home to 350 people living in two-storey houses, and

1160-751: A number of organisational changes, the legion system survived the fall of the Western Roman Empire . It was continued within the Eastern Roman Empire until the 7th century, when reforms begun by Emperor Heraclius to supply the increasing need for soldiers resulted in the Theme system . Despite this, the Eastern Roman armies continued to be influenced by the earlier Roman legions, and were maintained with similar levels of discipline, strategic prowess, and organization. Aside from

1276-539: A result, very very few kotas still stand to this day. Notable kotas: During Muhammad 's era in Arabia, many tribes made use of fortifications. In the Battle of the Trench , the largely outnumbered defenders of Medina, mainly Muslims led by Islamic prophet Muhammad, dug a trench , which together with Medina's natural fortifications, rendered the confederate cavalry (consisting of horses and camels ) useless, locking

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1392-531: A series of straight lines creating the central fortified area that gives this style of fortification its name. Roman legion The Roman legion ( Latin : legiō , Latin: [ˈɫɛɡioː] ), the largest military unit of the Roman army , was composed of Roman citizens serving as legionaries . During the Roman Republic the manipular legion comprised 4,200 infantry and 300 cavalry. After

1508-452: A single organisation (and was later made official and put under a legatus and six duces ). At the end of the civil war against Mark Antony , Augustus was left with around fifty legions, with several double counts (multiple Legio Xs for instance). For political and economic reasons, Augustus reduced the number of legions to 28 (which diminished to 25 after the Battle of Teutoburg Forest , in which three legions were completely destroyed by

1624-462: A sizeable supplement to their regular pay. All legionary soldiers would also receive a praemia ( veterans' benefits ) on completion of their term of service of 25 years or more: a sizeable sum of money (3,000 denarii from the time of Augustus ) and/or a plot of good farmland (good land was in much demand); farmland given to veterans often helped in establishing control of the frontier regions and over rebellious provinces. Later, under Caracalla ,

1740-408: A year. However, the soldiers did not receive all the money in cash, as the state deducted a clothing and food tax from their pay. To this wage, a legionary on active campaign would hope to add the booty of war, from the bodies of their enemies and as plunder from enemy settlements. Slaves could also be claimed from the prisoners of war and divided amongst the legion for later sale, which would bring in

1856-561: Is also an intermediate branch known as semi-permanent fortification. Castles are fortifications which are regarded as being distinct from the generic fort or fortress in that they are a residence of a monarch or noble and command a specific defensive territory. Roman forts and hill forts were the main antecedents of castles in Europe, which emerged in the 9th century in the Carolingian Empire . The Early Middle Ages saw

1972-428: Is another example of a Gaulish fortified settlement. The term casemate wall is used in the archaeology of Israel and the wider Near East , having the meaning of a double wall protecting a city or fortress, with transverse walls separating the space between the walls into chambers. These could be used as such, for storage or residential purposes, or could be filled with soil and rocks during siege in order to raise

2088-548: Is employed when in the course of a campaign it becomes desirable to protect some locality with the best imitation of permanent defences that can be made in a short time, ample resources and skilled civilian labour being available. An example of this is the construction of Roman forts in England and in other Roman territories where camps were set up with the intention of staying for some time, but not permanently. Castles are fortifications which are regarded as being distinct from

2204-519: Is formally known as poliorcetics . In some texts, this latter term also applies to the art of building a fortification. Fortification is usually divided into two branches: permanent fortification and field fortification. Permanent fortifications are erected at leisure, with all the resources that a state can supply of constructive and mechanical skill, and are built of enduring materials. Field fortifications—for example breastworks —and often known as fieldworks or earthworks, are extemporized by troops in

2320-485: Is naturally protected by cliffs, especially on the south side, which are up to 20 metres (66 ft) in height. A water pool, located on the northwestern side was the main water supply to the fortress. The ruins are situated in mounds. The defences first consisted of huge ramparts built of large boulders, consolidated with earth and clay. There were initially gates to the north and south with additional protection from moats and outer ramparts. There were several buildings for

2436-486: Is still in good condition, and the outline of the fort is still remarkably clear given its age. The fortress at one time had a moat and outer wall, and the walls on the north and south side were higher, around 6 metres (20 ft) in height. The fort is located on a hill almost in the centre of the island, part of the Almindingen forest. It is several hundred yards off the main road from Rønne to Svaneke . The site

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2552-425: Is undocumented and shrouded in myths, but those myths tell that during the rule of Servius Tullius , the census (from Latin : censeō – accounting of the people) was introduced. With this all Roman able-bodied, property-owning male citizens were divided into five classes for military service based on their wealth and then organised into centuries as sub-units of the greater Roman army or legio (multitude). Joining

2668-483: The accensi , rorarii , and leves were replaced by the velites . Unit sizes were also expanded. Non-citizens or peregrini were also offered a position in the military as auxiliaries. The Republican legion evolved from 3,000 men in the Roman Republic to over 5,200 men in the Roman Empire , consisting of centuries as the basic units. Until the middle of the first century AD, ten cohorts made up

2784-746: The British Raj are found in the mainland Indian subcontinent (modern day India , Pakistan , Bangladesh and Nepal ). "Fort" is the word used in India for all old fortifications. Numerous Indus Valley Civilization sites exhibit evidence of fortifications. By about 3500 BC, hundreds of small farming villages dotted the Indus floodplain. Many of these settlements had fortifications and planned streets. The stone and mud brick houses of Kot Diji were clustered behind massive stone flood dykes and defensive walls, for neighbouring communities bickered constantly about

2900-862: The Germanics ). Beside streamlining the army, Augustus also regulated the soldiers' pay. At the same time, he greatly increased the number of auxiliaries to the point where they were equal in number to the legionaries. He also created the Praetorian Guard along with a permanent Roman navy where served the liberti , or freed slaves. The legions also became permanent at this time, and not recruited for particular campaigns. They were also allocated to static bases with permanent castra legionaria (legionary fortresses). Augustus' military policies proved sound and cost effective, and were generally followed by his successors. These emperors would carefully add new legions, as circumstances required or permitted, until

3016-1205: The Maratha Empire . A large majority of forts in India are in North India. The most notable forts are the Red Fort at Old Delhi , the Red Fort at Agra , the Chittor Fort and Mehrangarh Fort in Rajasthan , the Ranthambhor Fort , Amer Fort and Jaisalmer Fort also in Rajasthan and Gwalior Fort in Madhya Pradesh . Arthashastra , the Indian treatise on military strategy describes six major types of forts differentiated by their major modes of defenses. Forts in Sri Lanka date back thousands of years, with many being built by Sri Lankan kings. These include several walled cities. With

3132-584: The Marian reforms in 107 BC, the legions were formed of 5,200 men and were restructured around 10 cohorts, the first cohort being double strength. This structure persisted throughout the Principate and middle Empire, before further changes in the fourth century resulted in new formations of around 1,000 men. The size of a typical legion varied throughout the history of ancient Rome, with complements ranging from 4,200 legionaries and 300 equites (drawn from

3248-586: The Mediterranean . The fortifications were continuously being expanded and improved. Around 600 BC, in Heuneburg , Germany, forts were constructed with a limestone foundation supported by a mudbrick wall approximately 4 metres tall, probably topped by a roofed walkway, thus reaching a total height of 6 metres. The wall was clad with lime plaster, regularly renewed. Towers protruded outwards from it. The Oppidum of Manching (German: Oppidum von Manching)

3364-569: The Napoleonic wars . Most of the colonial forts were garrisoned up until the early 20th century. The coastal forts had coastal artillery manned by the Ceylon Garrison Artillery during the two world wars. Most of these were abandoned by the military but retained civil administrative officers, while others retained military garrisons, which were more administrative than operational. Some were reoccupied by military units with

3480-527: The Nordic states and in Britain , the fortifications of Berwick-upon-Tweed and the harbour archipelago of Suomenlinna at Helsinki being fine examples. During the 18th century, it was found that the continuous enceinte , or main defensive enclosure of a bastion fortress, could not be made large enough to accommodate the enormous field armies which were increasingly being employed in Europe; neither could

3596-613: The Notitia suggest that the process of creating new legions continued through the 4th century rather than being a single event. The names also suggest that many new legions were formed from vexillationes or from old legions. In addition, there were 24 vexillationes palatini, 73 vexillationes comitatenses ; 305 other units in the Eastern limitanei and 181 in the Western limitanei . A rare instance of apparent direct continuity between

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3712-707: The Old City of Shanghai , Suzhou , Xi'an and the walled villages of Hong Kong . The famous walls of the Forbidden City in Beijing were established in the early 15th century by the Yongle Emperor . The Forbidden City made up the inner portion of the Beijing city fortifications . During the Spanish Era several forts and outposts were built throughout the archipelago. Most notable is Intramuros ,

3828-618: The Siege of Ta'if in January 630, Muhammad ordered his followers to attack enemies who fled from the Battle of Hunayn and sought refuge in the fortress of Taif. The entire city of Kerma in Nubia (present day Sudan) was encompassed by fortified walls surrounded by a ditch. Archaeology has revealed various Bronze Age bastions and foundations constructed of stone together with either baked or unfired brick. The walls of Benin are described as

3944-634: The Tang dynasty (618–907 AD). The Great Wall of China had been built since the Qin dynasty (221–207 BC), although its present form was mostly an engineering feat and remodelling of the Ming dynasty (1368–1644 AD). In addition to the Great Wall, a number of Chinese cities also employed the use of defensive walls to defend their cities. Notable Chinese city walls include the city walls of Hangzhou , Nanjing ,

4060-768: The Theodosian Walls of Constantinople , together with partial remains elsewhere. These are mostly city gates, like the Porta Nigra in Trier or Newport Arch in Lincoln . Hadrian's Wall was built by the Roman Empire across the width of what is now northern England following a visit by Roman Emperor Hadrian (AD 76–138) in AD ;122. A number of forts dating from the Later Stone Age to

4176-581: The Varian Disaster (September 9, AD 9) and never raised again by the Romans thereafter. Quintili Vare, legiones redde! ( Quintilius Varus, give me back my legions! ) Almost nothing is known about the legion of the Roman Kingdom period that could have included 1000 men from each of the three original Roman tribes . The earliest surviving detailed description comes from Polybius , who

4292-418: The praemia increased to 5,000 denarii . From 104 BC onwards, each legion used an aquila (eagle) as its standard symbol. The symbol was carried by an officer known as aquilifer , and its loss was considered to be a very serious embarrassment, and often led to the disbanding of the legion itself. Normally, this was because any legion incapable of regaining its eagle in battle was so severely mauled that it

4408-405: The republican era , a legion was divided into three lines, each of ten maniples. In the late Republic and much of the imperial period (from about 100 BC), a legion was divided into ten cohorts, each of six (or five) centuries. Legions also included a small ala , or cavalry unit. By the third century AD, the legion was a much smaller unit of about 1,000 to 1,500 men, and there were more of them. In

4524-401: The "Great Wall of Brodgar" it was 4 metres (13 ft) thick and 4 metres tall. The wall had some symbolic or ritualistic function. The Assyrians deployed large labour forces to build new palaces , temples and defensive walls. In Bronze Age Malta , some settlements also began to be fortified. The most notable surviving example is Borġ in-Nadur , where a bastion built in around 1500 BC

4640-530: The 19th and early 20th centuries. The advances in modern warfare since World War I have made large-scale fortifications obsolete in most situations. Many United States Army installations are known as forts, although they are not always fortified. During the pioneering era of North America, many outposts on the frontiers, even non-military outposts, were referred to generically as forts. Larger military installations may be called fortresses; smaller ones were once known as fortalices. The word fortification can refer to

4756-684: The Imperial era, the legions played an important political role. Their actions could secure the empire for a usurper or take it away. For example, the defeat of Vitellius in the Year of the Four Emperors was decided when the Danubian legions chose to support Vespasian . In the Empire, the legion was standardised, with symbols and an individual history where men were proud to serve. The legion

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4872-593: The Indus Valley Civilization were fortified. Forts also appeared in urban cities of the Gangetic valley during the second urbanisation period between 600 and 200 BC, and as many as 15 fortification sites have been identified by archaeologists throughout the Gangetic valley, such as Kaushambi , Mahasthangarh , Pataliputra , Mathura , Ahichchhatra , Rajgir , and Lauria Nandangarh . The earliest Mauryan period brick fortification occurs in one of

4988-641: The Iron Age and peaking in Iron Age II (10th–6th century BC). However, the construction of casemate walls had begun to be replaced by sturdier solid walls by the 9th century BC , probably due the development of more effective battering rams by the Neo-Assyrian Empire . Casemate walls could surround an entire settlement, but most only protected part of it. The three different types included freestanding casemate walls, then integrated ones where

5104-530: The Later Roman Empire, the legion was reduced in size to 1,000 to allow for easier provisioning and to expand the regions under surveillance. Numbers would also vary depending on casualties suffered during a campaign; Julius Caesar 's legions during his campaign in Gaul often only had around 3,500 men. Tactics were not very different from the past, but their effectiveness was largely improved because of

5220-403: The Republic, when warfare was mostly concentrated on raiding, it is uncertain if the full manpower of the legions was summoned at any one time. In 494 BC, when three foreign threats emerged, the dictator Manius Valerius Maximus raised ten legions which Livy says was a greater number than had been raised previously at any one time. Also, some warfare was still conducted by Roman forces outside

5336-518: The ancient site of Mycenae (famous for the huge stone blocks of its ' cyclopean ' walls). In classical era Greece , the city of Athens built two parallel stone walls, called the Long Walls , that reached their fortified seaport at Piraeus a few miles away. In Central Europe , the Celts built large fortified settlements known as oppida , whose walls seem partially influenced by those built in

5452-403: The army consisted of auxiliaries , who provided additional infantry and the vast majority of the Roman cavalry (provincials who aspired to Roman citizenship gained it when honourably discharged from the auxiliaries). The Roman army, for most of the Imperial period, consisted mostly of auxiliaries rather than legions. Many of the legions founded before 40 BC were still active until at least

5568-460: The army was both a duty and a distinguishing mark of Roman citizenship; the wealthiest land owners performed the most years of military service. These individuals would have had the most to lose should the state have fallen. At some point after the overthrow of the Roman monarchy the legio was subdivided into two separate legions, each one ascribed to one of the two consuls . In the first years of

5684-410: The arrival of cannons on the 14th century battlefield . Fortifications in the age of black powder evolved into much lower structures with greater use of ditches and earth ramparts that would absorb and disperse the energy of cannon fire. Walls exposed to direct cannon fire were very vulnerable, so were sunk into ditches fronted by earth slopes. This placed a heavy emphasis on the geometry of

5800-443: The consular armies (two per consul), other units were levied by campaign. Rome's Italian allies were required to provide approximately ten cohorts (auxilia were not organised into legions) to support each Roman Legion. In the middle of the Republic, legions were composed of the following units: Each of these three lines was subdivided into (usually ten) chief tactical units called maniples . A maniple consisted of two centuries and

5916-566: The control of prime agricultural land. The fortification varies by site. While Dholavira has stone-built fortification walls, Harrapa is fortified using baked bricks; sites such as Kalibangan exhibit mudbrick fortifications with bastions and Lothal has a quadrangular fortified layout. Evidence also suggested of fortifications in Mohenjo-daro . Even a small town—for instance, Kotada Bhadli, exhibiting sophisticated fortification-like bastions—shows that nearly all major and minor towns of

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6032-407: The creation of some towns built around castles. Medieval-style fortifications were largely made obsolete by the arrival of cannons in the 14th century. Fortifications in the age of black powder evolved into much lower structures with greater use of ditches and earth ramparts that would absorb and disperse the energy of cannon fire. Walls exposed to direct cannon fire were very vulnerable, so

6148-964: The current level of military development. During the Renaissance era , the Venetian Republic raised great walls around cities, and the finest examples, among others, are in Nicosia (Cyprus), Rocca di Manerba del Garda (Lombardy), and Palmanova (Italy), or Dubrovnik (Croatia), which proved to be futile against attacks but still stand to this day. Unlike the Venetians, the Ottomans used to build smaller fortifications but in greater numbers, and only rarely fortified entire settlements such as Počitelj , Vratnik , and Jajce in Bosnia . Medieval-style fortifications were largely made obsolete by

6264-490: The defences be constructed far enough away from the fortress town to protect the inhabitants from bombardment by the besiegers, the range of whose guns was steadily increasing as better manufactured weapons were introduced. Threfore, since refortifying the Prussian fortress cities of Koblenz and Cologne after 1815, the principle of the ring fortress or girdle fortress was used: forts, each several hundred metres out from

6380-455: The elite palatini , other legions called comitatenses and pseudocomitatenses , along with the auxilia palatina , provided the infantry of late Roman armies. The Notitia Dignitatum lists 25 legiones palatinae , 70 legiones comitatenses , 47 legiones pseudocomitatenses and 111 auxilia palatina in the field armies, and a further 47 legiones in the frontier armies. Legion names such as Honoriani and Gratianenses found in

6496-550: The engineers, record-keepers, the praefectus castrorum (commander of the camp) and other specialists such as priests and musicians. In the Later Roman Empire , the number of legions was increased and the Roman army expanded. There is no evidence to suggest that legions changed in form before the Tetrarchy , although there is evidence that they were smaller than the paper strengths usually quoted. The final form of

6612-728: The escalation of the Sri Lankan Civil War ; Jaffna fort , for example, came under siege several times. Large tempered earth (i.e. rammed earth ) walls were built in ancient China since the Shang dynasty ( c.  1600 –1050 BC); the capital at ancient Ao had enormous walls built in this fashion (see siege for more info). Although stone walls were built in China during the Warring States (481–221 BC), mass conversion to stone architecture did not begin in earnest until

6728-400: The field, perhaps assisted by such local labour and tools as may be procurable and with materials that do not require much preparation, such as soil, brushwood, and light timber , or sandbags (see sangar ). An example of field fortification was the construction of Fort Necessity by George Washington in 1754. There is also an intermediate branch known as semi-permanent fortification. This

6844-506: The fifth century, notably Legio V Macedonica , which was founded by Augustus in 43 BC and was in Egypt in the seventh century during the Islamic conquest of Egypt . On the other hand, Legio XVII ("Seventeenth Legion"), Legio XVIII ("Eighteenth Legion") and Legio XIX ("Nineteenth Legion"), founded by Augustus around 41 BC, were destroyed by a Germanic alliance led by Arminius in

6960-481: The first cohort being almost double-strength at 800 men). These are typical field strengths while "paper strength" was slightly higher (e.g. 600 and 1,200 respectively for Imperial cohorts). In the early Roman Kingdom the term legion may have meant the entire Roman army , but sources on this period are few and unreliable. The subsequent organisation of legions varied greatly over time but legions were typically composed of around five thousand soldiers. During much of

7076-405: The first small cities to be fortified. In ancient Greece , large stone walls had been built in Mycenaean Greece , such as the ancient site of Mycenae (known for the huge stone blocks of its ' cyclopean ' walls). A Greek phrourion was a fortified collection of buildings used as a military garrison , and is the equivalent of the Roman castellum or fortress. These constructions mainly served

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7192-408: The fortification to allow defensive cannonry interlocking fields of fire to cover all approaches to the lower and thus more vulnerable walls. The evolution of this new style of fortification can be seen in transitional forts such as Sarzanello in North West Italy which was built between 1492 and 1502. Sarzanello consists of both crenellated walls with towers typical of the medieval period but also has

7308-409: The fourth century AD, East Roman border guard legions ( limitanei ) may have become even smaller. In terms of organization and function, the republican era legion may have been influenced by the ancient Greek and Macedonian phalanx . For most of the Roman Imperial period, the legions formed the Roman army's elite heavy infantry , recruited exclusively from Roman citizens, while the remainder of

7424-418: The frontiers of the Nile Valley to protect against invaders from neighbouring territories, as well as circle-shaped mud brick walls around their cities. Many of the fortifications of the ancient world were built with mud brick, often leaving them no more than mounds of dirt for today's archaeologists. A massive prehistoric stone wall surrounded the ancient temple of Ness of Brodgar 3200 BC in Scotland . Named

7540-504: The generic fort or fortress in that it describes a residence of a monarch or noble and commands a specific defensive territory. An example of this is the massive medieval castle of Carcassonne . Defensive fences for protecting humans and domestic animals against predators was used long before the appearance of writing and began "perhaps with primitive man blocking the entrances of his caves for security from large carnivores ". From very early history to modern times, walls have been

7656-405: The height of the Maguindanao Sultanate 's power, they blanketed the areas around Western Mindanao with kotas and other fortifications to block the Spanish advance into the region. These kotas were usually made of stone and bamboo or other light materials and surrounded by trench networks. As a result, some of these kotas were burned easily or destroyed. With further Spanish campaigns in the region,

7772-413: The inner wall was part of the outer buildings of the settlement, and finally filled casemate walls, where the rooms between the walls were filled with soil right away, allowing for a quick, but nevertheless stable construction of particularly high walls. The Romans fortified their cities with massive, mortar-bound stone walls. The most famous of these are the largely extant Aurelian Walls of Rome and

7888-402: The intervals between them. The arrival of explosive shells in the 19th century led to yet another stage in the evolution of fortification. Star forts did not fare well against the effects of high explosives and the intricate arrangements of bastions, flanking batteries and the carefully constructed lines of fire for the defending cannon could be rapidly disrupted by explosive shells. Worse,

8004-413: The large open ditches surrounding forts of this type were an integral part of the defensive scheme, as was the covered way at the edge of the counter scarp . The ditch was extremely vulnerable to bombardment with explosive shells. In response, military engineers evolved the polygonal style of fortification. The ditch became deep and vertically sided, cut directly into the native rock or soil, laid out as

8120-410: The leader who had hired or raised them. Such independent organisation persisted until the 2nd century BC amongst light infantry and cavalry, but was discarded completely in later periods with the supporting role taken instead by allied troops. The roles of century leader (later formalised as a centurion ), second in command and standard bearer are referenced in this early period. Rome's early period

8236-450: The legion a formidable siege train of 59 ballistae and 10 onagers, each manned by 10 libritors (artillerymen) and mounted on wagons drawn by oxen or mules. In addition to attacking cities and fortifications, these would be used to help defend Roman forts and fortified camps ( castra ) as well. They would even be employed on occasion, especially in the later Empire, as field artillery during battles or in support of river crossings. Despite

8352-556: The legion originated with the elite legiones palatinae created by Diocletian and the Tetrarchs. These were infantry units of around 1,000 men rather than the 5,000, including cavalry, of the old legions. The earliest legiones palatinae were the Lanciarii , Joviani , Herculiani and Divitenses . The 4th century saw a very large number of new, small legions created, a process which began under Constantine II . In addition to

8468-509: The legionary structure, the most famous example being the campaign in 479 BC by the clan army of gens Fabia against the Etruscan city of Veii (in which the clan was annihilated). Legions became more formally organised in the 4th century BC, as Roman warfare evolved to more frequent and planned operations, and the consular army was raised to two legions each. In the Republic, legions had an ephemeral existence. Except for Legio I to IV, which were

8584-535: The legions of the early Empire and those of the post-6th century army was Legion V Macedonica ; created in 43 BC, recorded in the Notitia Dignitatum as a legione comitatense under the title of Quinta Macedonica and surviving in Egypt until the Arab conquest of 637 AD. According to the late Roman writer Vegetius ' De re militari , each century had a ballista and each cohort had an onager , giving

8700-480: The main antecedents of castles in Europe , which emerged in the 9th century in the Carolingian Empire . The Early Middle Ages saw the creation of some towns built around castles. These cities were only rarely protected by simple stone walls and more usually by a combination of both walls and ditches . From the 12th century, hundreds of settlements of all sizes were founded all across Europe, which very often obtained

8816-444: The many and varied duties of the Roman army. There were three pay grades within the rank of legionary: standard, one and a half, and twice the basic pay rate. Legionaries received 225 denarii a year (equal to 900 sestertii ) until Domitian , who increased it to 300 denarii . In spite of the steady inflation during the 2nd century, there was no further rise until the time of Septimius Severus , who increased it to 500 denarii

8932-414: The more prestigious legions and those stationed on hostile borders or in restive provinces tending to have more auxiliaries. By the time of the emperor Severus , 193–211, the auxiliaries may have composed 55 to 60% of the army, 250,000 of 447,000. Some legions may have even been reinforced at times with units making the associated force near 15,000–16,000 or about the size of a modern division . Throughout

9048-489: The north and southwest. Around 1100, significant alterations were made and it was reinforced, but it was abandoned soon afterwards in favour of the fortification of Lilleborg , roughly 700 metres (2,300 ft) to the northeast. The fortress is Bornholm's oldest defence works. Its builder is unknown, but an account of the Baltic Sea travels of Wulfstan of Hedeby in 890 tells us that Bornholm already had its own king at

9164-425: The occupants and their stores. Two stone lined embankments can still be seen aside the west entrance. Outside the old western rampart, the site was fortified with a solid stone wall, 275 metres (902 ft) long, 2 metres (6 ft 7 in) wide and up to 6 metres (20 ft) high. The north gate was significantly widened and there was probably a watchtower on the northwest corner of the rampart. The old south gate

9280-539: The old walled city of Manila located along the southern bank of the Pasig River . The historic city was home to centuries-old churches, schools, convents, government buildings and residences, the best collection of Spanish colonial architecture before much of it was destroyed by the bombs of World War II . Of all the buildings within the 67-acre city, only one building, the San Agustin Church, survived

9396-429: The old use of the legion drawn up in three lines of battle using three classes of soldier (each century would then hold a cross-section of this theoretical line, although these century titles were now essentially nominal). Each of the three lines is then sub-divided within the century into a more forward and a more rear century. The Roman army maintained a complex position and grading system for its soldiers that reflected

9512-440: The original enceinte, were carefully sited so as to make best use of the terrain and to be capable of mutual support with the neighbouring forts. Gone were citadels surrounding towns: forts were to be moved to the outside of the cities some 12 km to keep the enemy at a distance so their artillery could not bombard the city center. From now on a ring of forts were to be built at a spacing that would allow them to effectively cover

9628-738: The outset of colonial rule in the Indian Ocean , Sri Lanka was occupied by several major colonial empires that from time to time became the dominant power in the Indian Ocean. The colonists built several western-style forts, mostly in and around the coast of the island. The first to build colonial forts in Sri Lanka were the Portuguese ; these forts were captured and later expanded by the Dutch . The British occupied these Dutch forts during

9744-409: The practice of improving an area's defense with defensive works. City walls are fortifications but are not necessarily called fortresses. The art of setting out a military camp or constructing a fortification traditionally has been called castrametation since the time of the Roman legions . Laying siege to a fortification and of destroying it is commonly called siegecraft or siege warfare and

9860-480: The professional training of the soldiers. Throughout the history of Rome's Late Republic, the legions played an important political role. By the 1st century BC, the threat of the legions under a demagogue was recognised. Roman governors were not allowed to leave their provinces with their legions. When Julius Caesar broke this rule, leaving his province of Gaul and crossing the Rubicon into Italy, he precipitated

9976-471: The purpose of a watch tower, to guard certain roads, passes, and borders. Though smaller than a real fortress, they acted as a border guard rather than a real strongpoint to watch and maintain the border. The art of setting out a military camp or constructing a fortification traditionally has been called "castrametation" since the time of the Roman legions . Fortification is usually divided into two branches: permanent fortification and field fortification. There

10092-400: The rank and file legionary (who received the base wage of 10 assēs a day or 225 denarii a year), the following list describes the system of officers which developed within the legions from the late republic (100s BC) until the military reforms of Diocletian ( c.  290 ). The rank of centurion was an officer grade that held much responsibility. The most senior centurion in

10208-656: The resistance of the outer wall against battering rams. Originally thought to have been introduced to the region by the Hittites , this has been disproved by the discovery of examples predating their arrival, the earliest being at Ti'inik (Taanach) where such a wall has been dated to the 16th century BC . Casemate walls became a common type of fortification in the Southern Levant between the Middle Bronze Age (MB) and Iron Age II, being more numerous during

10324-473: The result of hostilities. Excavations in the 1950s showed the fortifications originated in the Viking period although there is evidence the site was used as a hideout in the Iron Age. The ruins that can be seen today are mainly the result of reconstruction work completed in about 1100. The fortress is 27,000 square metres (290,000 sq ft) in size. Part of the wall, built of rocks and boulders set in clay,

10440-429: The right of fortification soon afterward. The founding of urban centres was an important means of territorial expansion and many cities, especially in eastern Europe , were founded precisely for this purpose during the period of Eastern Colonisation . These cities are easy to recognise due to their regular layout and large market spaces. The fortifications of these settlements were continuously improved to reflect

10556-489: The stockades by mounting old-fashioned bayonet charges, after laying down some covering fire. Defensive works were of importance in the tropical African Kingdoms. In the Kingdom of Kongo field fortifications were characterized by trenches and low earthen embankments. Such strongpoints ironically, sometimes held up much better against European cannon than taller, more imposing structures. Roman forts and hill forts were

10672-467: The strength of the standing army stood at around 30 legions (hence the wry remark of the philosopher Favorinus that It is ill arguing with the master of 30 legions ). With each legion having 5,120 legionaries usually supported by an equal number of auxiliary troops (according to Tacitus), the total force available to a legion commander during the Pax Romana probably ranged from 11,000 downwards, with

10788-438: The stupa mounds of Lauria Nandangarh, which is 1.6 km in perimeter and oval in plan and encloses a habitation area. Mundigak ( c.  2500 BC ) in present-day south-east Afghanistan has defensive walls and square bastions of sun dried bricks. India currently has over 180 forts, with the state of Maharashtra alone having over 70 forts, which are also known as durg , many of them built by Shivaji , founder of

10904-636: The sultanate was subdued and a majority of kotas dismantled or destroyed. kotas were not only used by the Muslims as defense against Spaniards and other foreigners, renegades and rebels also built fortifications in defiance of other chiefs in the area. During the American occupation, rebels built strongholds and the datus, rajahs, or sultans often built and reinforced their kotas in a desperate bid to maintain rule over their subjects and their land. Many of these forts were also destroyed by American expeditions, as

11020-418: The time. There is, however, firm evidence that the fortress was in use during the reigns of Harald Bluetooth (940–986) and Canute IV (1080–1086). Gamleborg was used as refuge during the tenth century against Viking raids. Gamleborg was abandoned in 1150, the occupants moving to Lilleborg, only 700 metres (2,300 ft) to the northwest. It is not known why the move was made but it does not appear to have been

11136-485: The two sides in a stalemate. Hoping to make several attacks at once, the confederates persuaded the Medina-allied Banu Qurayza to attack the city from the south. However, Muhammad's diplomacy derailed the negotiations, and broke up the confederacy against him. The well-organized defenders, the sinking of confederate morale, and poor weather conditions caused the siege to end in a fiasco. During

11252-499: The walls were sunk into ditches fronted by earth slopes to improve protection. The arrival of explosive shells in the 19th century led to another stage in the evolution of fortification. Star forts did not fare well against the effects of high explosives, and the intricate arrangements of bastions, flanking batteries and the carefully constructed lines of fire for the defending cannon could be rapidly disrupted by explosive shells. Steel -and- concrete fortifications were common during

11368-559: The war. Partial listing of Spanish forts: The Ivatan people of the northern islands of Batanes built their so-called idjang on hills and elevated areas to protect themselves during times of war. These fortifications were likened to European castles because of their purpose. Usually, the only entrance to the castles would be via a rope ladder that would only be lowered for the villagers and could be kept away when invaders arrived. The Igorots built forts made of stone walls that averaged several meters in width and about two to three times

11484-445: The wealthier classes – in early Rome all troops provided their own equipment) in the Republic, to 5,500 in the Imperial period, when most legions were led by a Roman Imperial Legate. A legion had 4,800 legionaries (in 10 cohorts of 6 centuries of 80 legionaries) from the late republic to the time of Julius Caesar . It expanded to 5,280 men plus 120 auxiliaries in the Imperial period (split into 10 cohorts, nine of 480 men each, with

11600-410: The width in height around 2000 BC. The Muslim Filipinos of the south built strong fortresses called kota or moong to protect their communities. Usually, many of the occupants of these kotas are entire families rather than just warriors. Lords often had their own kotas to assert their right to rule, it served not only as a military installation but as a palace for the local Lord. It is said that at

11716-634: The world's second longest man-made structure, as well as the most extensive earthwork in the world, by the Guinness Book of Records, 1974 . The walls may have been constructed between the thirteenth and mid-fifteenth century CE or, during the first millennium CE. Strong citadels were also built other in areas of Africa. Yorubaland for example had several sites surrounded by the full range of earthworks and ramparts seen elsewhere, and sited on ground. This improved defensive potential—such as hills and ridges. Yoruba fortifications were often protected with

11832-430: Was a large Celtic proto-urban or city-like settlement at modern-day Manching (near Ingolstadt), Bavaria (Germany). The settlement was founded in the 3rd century BC and existed until c.  50–30 BC . It reached its largest extent during the late La Tène period (late 2nd century BC), when it had a size of 380 hectares. At that time, 5,000 to 10,000 people lived within its 7.2 km long walls. The oppidum of Bibracte

11948-410: Was also a reconnaissance squad of ten or more light mounted infantry called speculatores , who could also serve as messengers or even as an early form of military intelligence service. A typical legion of this period had 5,120 legionaries as well as a large number of camp followers, servants and slaves. Legions could contain as many as 11,000 fighting men when including the auxiliaries. During

12064-480: Was broken down into smaller units – originally temporary detachments – to cover more territory. In the fourth century AD, East Roman border guard legions ( limitanei ) may have become even smaller. In the period before the raising of the legio and the early years of the Roman Kingdom and the Roman Republic , forces are described as being organised into centuriae of roughly one hundred men. These centuries were grouped together as required and answered to

12180-458: Was commanded by a legatus or legate . Aged around thirty, he would usually be a senator on a three-year appointment. Immediately subordinate to the legate would be six elected military tribunes – five would be staff officers and the remaining one would be a noble heading for the Senate (originally this tribune commanded the legion). There would also be a group of officers for the medical staff,

12296-412: Was commanded by the senior of the two centurions . At this time, each century of hastati and principes consisted of 60 men; a century of triarii was 30 men. These 3,000 men (twenty maniples of 120 men, and ten maniples of 60 men), together with about 1,200 velites and 300 cavalry gave the mid Republican ("manipular") legion a nominal strength of about 4,500 men. Each century had its own standard and

12412-658: Was employed in later wars against the British to block British advances. Some of these fortifications were over a hundred yards long, with heavy parallel tree trunks. They were impervious to destruction by artillery fire. Behind these stockades, numerous Ashanti soldiers were mobilized to check enemy movement. While formidable in construction, many of these strongpoints failed because Ashanti guns, gunpowder and bullets were poor, and provided little sustained killing power in defense. Time and time again British troops overcame or bypassed

12528-521: Was encircled by a fortified wall. The huge walls around the settlement, which were built very tall and with stone blocks which are 6 feet (1.8 m) high and 4.5 feet (1.4 m) thick, make it one of the earliest walled settlements in Europe but it is younger than the walled town of Sesklo in Greece from 6800 BC. Uruk in ancient Sumer ( Mesopotamia ) is one of the world's oldest known walled cities . The Ancient Egyptians also built fortresses on

12644-412: Was followed by the five other century commanders of the first cohort, who were known as primi ordines . There is a story of one centurion, Petronius Fortunatus, making rank in four years, then spending the next forty-two years in twelve different legions never once serving in the primi ordines . The six centuries of a normal cohort, were, in order of precedence: The centuries took their titles from

12760-501: Was found. Exceptions were few—notably, ancient Sparta and ancient Rome did not have walls for a long time, choosing to rely on their militaries for defence instead. Initially, these fortifications were simple constructions of wood and earth, which were later replaced by mixed constructions of stones piled on top of each other without mortar . In ancient Greece , large stone walls had been built in Mycenaean Greece , such as

12876-933: Was made up of ten units ( contubernia ) of eight men who shared a tent, a millstone, a mule and cooking pot . Full Roman citizenship was open to all the regions of Italy. At the same time, the three different types of heavy infantry were replaced by a single, standard type based on the principes : armed with two heavy javelins called pila (singular pilum ), the short sword called gladius , chain mail ( lorica hamata ), helmet and rectangular shield ( scutum ). The role of allied legions would eventually be taken up by contingents of allied auxiliary troops, called auxilia . Auxilia contained immunes (specialist units), engineers and pioneers, artillerymen and craftsmen, service and support personnel and irregular units made up of non-citizens, mercenaries and local militia. These were usually formed into complete units such as light cavalry, light infantry or velites , and labourers. There

12992-485: Was no longer effective in combat. In Gallic War (Bk IV, Para. 25), Julius Caesar describes an incident at the start of his first invasion of Britain in 55 BC that illustrated how fear for the safety of the eagle could drive Roman soldiers. When Caesar's troops hesitated to leave their ships for fear of the Britons, the aquilifer of the tenth legion threw himself overboard and, carrying the eagle, advanced alone against

13108-478: Was published by Giovanni Battista Zanchi in 1554. Fortifications also extended in depth, with protected batteries for defensive cannonry, to allow them to engage attacking cannons to keep them at a distance and prevent them from bearing directly on the vulnerable walls. The result was star shaped fortifications with tier upon tier of hornworks and bastions , of which Fort Bourtange is an excellent example. There are also extensive fortifications from this era in

13224-539: Was the triarii , the final line of the formation who instead fought as hoplites, using Greek clipei and whose wealth could afford them gladii in the case of a broken spear. By the 3rd century BC, this system was seen to be inefficient. Under the new Polybian system the ranks were no longer structured by wealth, and instead by age and experience. All legionaries had their hastae replaced by gladii , along with two pila , which were used as an opening volley before melee . The former classes of poor legionaries,

13340-508: Was walled up and replaced by a larger entrance on the southwest corner. 55°6′51″N 14°54′24″E  /  55.11417°N 14.90667°E  / 55.11417; 14.90667 Fortification From very early history to modern times, defensive walls have often been necessary for cities to survive in an ever-changing world of invasion and conquest . Some settlements in the Indus Valley Civilization were

13456-467: Was writing c.  150 BC and his account most likely was influenced by the organization of the Roman army after the defeat of Hannibal in the Punic wars some 50 years earlier. The legions of the Republic were only conscripted in times of conflict and usually limited to four legions, two to be commanded by each consul, though more could be levied if needed. Legionaries lacked the opportunity of

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