A Roman siege tower or breaching tower is a specialized siege engine, constructed to protect assailants and ladders while approaching the defensive walls of a fortification. The tower was often rectangular with four wheels with its height roughly equal to that of the wall or sometimes higher to allow archers or crossbowmen to stand on top of the tower and shoot arrows or quarrels into the fortification. Because the towers were wooden and thus flammable, they had to have some non-flammable covering of iron or fresh animal skins.
A castle is a type of fortified structure built during the Middle Ages predominantly by the nobility or royalty and by military orders. Scholars usually consider a castle to be the private fortified residence of a lord or noble. This is distinct from a mansion, palace, and villa, whose main purpose was exclusively for pleasance and are not primarily fortresses but may be fortified. Use of the term has varied over time and, sometimes, has also been applied to structures such as hill forts and 19th- and 20th-century homes built to resemble castles. Over the Middle Ages, when genuine castles were built, they took on a great many forms with many different features, although some, such as curtain walls, arrowslits, and portcullises, were commonplace.
A hillfort is a type of fortified refuge or defended settlement located to exploit a rise in elevation for defensive advantage. They are typical of the late European Bronze Age and Iron Age. Some were used in the post-Roman period. The fortification usually follows the contours of a hill and consists of one or more lines of earthworks or stone ramparts, with stockades or defensive walls, and external ditches. If enemies were approaching, the civilians would spot them from a distance.
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.
A motte-and-bailey castle is a European fortification with a wooden or stone keep situated on a raised area of ground called a motte, accompanied by a walled courtyard, or bailey, surrounded by a protective ditch and palisade. Relatively easy to build with unskilled labour, but still militarily formidable, these castles were built across northern Europe from the 10th century onwards, spreading from Normandy and Anjou in France, into the Holy Roman Empire, as well as the Low Countries it controlled, in the 11th century, when these castles were popularized in the area that became the Netherlands. The Normans introduced the design into England and Wales. Motte-and-bailey castles were adopted in Scotland, Ireland, and Denmark in the 12th and 13th centuries. By the end of the 13th century, the design was largely superseded by alternative forms of fortification, but the earthworks remain a prominent feature in many countries.
A concentric castle is a castle with two or more concentric curtain walls, such that the outer wall is lower than the inner and can be defended from it. The layout was square where the terrain permitted, or an irregular polygon where curtain walls of a spur castle followed the contours of a hill.
A casemate is a fortified gun emplacement or armoured structure from which guns are fired, in a fortification, warship, or armoured fighting vehicle.
Hadleigh Castle is a ruined fortification in the English county of Essex, overlooking the Thames Estuary from south of the town of Hadleigh. Built after 1215 during the reign of Henry III by Hubert de Burgh, the castle was surrounded by parkland and had an important economic and defensive role. The castle was significantly expanded and remodelled by Edward III, who turned it into a grander property, designed to defend against a potential French attack, as well as to provide the King with a convenient private residence close to London. Built on a soft hill of London clay, the castle has often been subject to subsidence; this, combined with the sale of its stonework in the 16th century, has led to it now being ruined. The remains are now preserved by English Heritage and protected under UK law as a Grade I listed building and scheduled monument.
Kerak Castle is a large medieval castle located in al-Karak, Jordan. It is one of the largest castles in the Levant. Construction began in the 1140s, under Pagan and Fulk, King of Jerusalem. The Crusaders called it Crac des Moabites or "Karak in Moab", as it is referred to in history books. It was also colloquially referred to as Krak of the Desert.
Sahyun Castle, also known as the Castle of Saladin, is a medieval castle in northwestern Syria. It is located 7 km east of Al-Haffah town and 30 km east of the city of Latakia, in high mountainous terrain on a ridge between two deep ravines and surrounded by forest, the site has been fortified since at least the mid 10th century. In 975 the Byzantine Emperor John I Tzimiskes captured the site and it remained under Byzantine control until around 1108. Early in the 12th century the Franks assumed control of the site and it was part of the newly formed Crusader state of the Principality of Antioch. The Crusaders undertook an extensive building programme, giving the castle much of its current appearance. In 1188 it fell to the forces of Saladin after a three-day siege. The castle was again besieged in 1287, this time both defender and belligerent were Mamluks. In 2006, the castles of Qal'at Salah El-Din and Krak des Chevaliers were recognised as a World Heritage Site by UNESCO. The site is owned by the Syrian government.
Montfort is a ruined Crusader castle in the Upper Galilee region in northern Israel, about 22 miles (35 km) northeast of the city of Haifa and 10 miles (16 km) south of the border with Lebanon.
A spur castle is a type of medieval fortification that is sited on a spur of a hill or mountain for defensive purposes. Ideally, it would be protected on three sides by steep hillsides; the only vulnerable side being that where the spur joins the hill from which it projects. By contrast, a ridge castle is only protected by steep terrain on two sides.
A bailey or ward in a fortification is a leveled courtyard, typically enclosed by a curtain wall. In particular, a medieval type of European castle is known as a motte-and-bailey. Castles and fortifications may have more than one bailey, and the enclosure wall building material may have been at first in wood, and later transitioned to stone. Their layout depends both on the local topography and the level of fortification technology employed, ranging from simple enclosures to elaborate concentric defences. In addition to the gradual evolution of more complex fortification plans, there are also significant differences in regional traditions of military architecture regarding subdivisions into baileys.
Bergfried is a tall tower that is typically found in castles of the Middle Ages in German-speaking countries and in countries under German influence. Stephen Friar in the Sutton Companion to Castles describes a bergfried as a "free-standing, fighting-tower". Its defensive function is to some extent similar to that of a keep in English or French castles. However, the characteristic difference between a bergfried and a keep is that a bergfried was typically not designed for permanent habitation.
A hill castle or mountain castle is a castle built on a natural feature that stands above the surrounding terrain. It is a term derived from the German Höhenburg used in categorising castle sites by their topographical location. Hill castles are thus distinguished from lowland castles (Niederungsburgen).
A bridge castle is a type of castle that was built to provide military observation and security for a river crossing. In the narrower sense it refers to castles that are built directly on or next to a bridge. Sometimes, however, castles close to a bridge are referred to as bridge castles.
Altendorf Castle was a medieval hill castle in the municipality of Altendorf in the canton of Schwyz. On the foundation of the round castle chapel stands the choir of the chapel of St. Johann.
Rothenberg Fortress is a fortress on the eponymous hill, 588 m, near Schnaittach in the Franconian Jura.
A Zwinger is an open kill zone area between two defensive walls that is used for defensive purposes. Zwingers were built in the post-classical and early modern periods to improve the defence of castles and town walls. The term is usually left untranslated, but is sometimes rendered as "outer courtyard", presumably referring to the subsequent role of a Zwinger as a castle's defences became redundant and it was converted into a palace or schloss; however, this belies its original purpose as a form of killing ground for the defence. The word is linked with zwingen, "to force", perhaps because the Zwinger forced an enemy to negotiate it before assaulting the main defensive line. Essenwein states that the "main purpose of this feature was so that the besieging force could not reach the actual castle wall very easily with battering rams or belfries, but had to stop at the lower, outer wall; also that two ranks of archers, behind and above one another, could fire upon the approaching enemy".
Counter-castles were built in the Middle Ages to counter the power of a hostile neighbour or as a siege castle, that is, a fortified base from which attacks could be launched on a nearby enemy castle.
