Several military machine installations come referred to as forts, although it is non universally fortified. Big forts could class when fort, little ones erst typically wore a title of fortalices. A word "fortification" can too refer to the practice of improving an region's defense by owning defensive works.

the art of laying out the military camp or even constructing a fortification traditionally classes when castrametation, since a period of the Roman legions. A art/science of laying siege to a fortification & of destroying it has a popular title of siegecraft and the formal title of poliorcetics. Around the select few texts this latter term too applies to the art of building a fortification.

Fortification is ordinarily divided into ii branches, videlicet permanent fortification and field fortification. Lasting fortifications come erected leisurely, by using all the resources that the state potty supply of constructive & mechanical skill, and come built of enduring materials. Field fortifications come extemporized by troops in the field, maybe assisted by such local labor & information when can be gettable, & by owning materials that don't involve tremendously preparation, like earth, brushwood and lightly timber. There exists besides an medium branch called semipermanent fortification. This is listed when around the course of a campaign it becomes worthy to protect occasionally neighborhood sustaining the better imitation of lasting defences that may be mass produced in a short period, ample resources & skilled civilian labor existence available.

Medieval-style fortifications were largely processed obsolete per arrival of cannons on the 14th century battlefield. Fortifications in the age of blackpowder evolved into much moo structures using greater have of ditches and earth ramparts that would absorb & disperse a energy of artillery fire. Bulwarks studied to direct artillery fire were super vulnerable, and so were sunk into ditches fronted by globe slopes. This located the heavily emphasis on the geometry of the fortification to allow defensive cannonry interlocking fields of fire to handle everthing approaches to the lower berth & so other vulnerable bulwarks. Fortifications as well extended within depth, by having secure batteries for defensive cannonry, to allow the children to locate assaultive cannon to keep the children at the few feet away & cease the children bearing directly on the vulnerable bulwarks. A effect was star shaped fortifications with tier upon tier of hornworks and bastions, of which Bourtange illustrated above is an excellent lesson. There are likewise extensive fortifications from either this era in the Nordic states and around Britain, the fortifications of Berwick on Tweed being a ticket case.

A arrival of explosive layers in the nineteenth centuary led to eventually an additional stage in the evolution of fortification. Star forts of a cannon era did non fare swell against a results of high explosive, & a intricate arrangements of bastions, flanking batteries & the carefully constructed lines of fire for the defending cannon can be speedily disrupted by explosive layers. Worse a big open ditches surrounding forts of this nature and severity were an integral section of a defensive scheme, when was a covered way at the edge of the counter scarp. A ditch was extremily vulnerable to bombardment by having explosive husks.

Inside response army engineer evolved a polygonal style of fortification. A ditch became deep & vertical sided, cut directly into a native rock, layed out as a series of straight lines creating a central fortified metropolitan area that gives this style of fortification its title.

Wide sufficiency to become an unpassable barrier for attacking troops, however narrow plenty to exist as a hard target for enemy shellfire, a ditch was swept by fire from either defensive blockhouses placed in the ditch, & firing positions turn over the outer face of the ditch itself.

the profile of a fort became super online indeed, surrounded outside the ditch by a gently sloping open vicinity, therefore when to provide there are no protection for an enemy to approach, piece the fort itself will bring a minimum target for enemy fire. a entrypoint became the sunken gatehouse in the inner face of the ditch, reached by the curved ramp that gave access to the gate via a rolling bridge that can be withdrawn into the gatehouse.

Lot of a fort moved underground, by having deep passages to attach a blockhouses & firing points in the ditch to the fort proper, by having magazines & machine rooms deep under the surface.

the guns yet were typically mounted withinside open emplacements, only protected by the parapet, two for a moo profile, & since experiance using guns in closed casemates experienced seen the two put away from action by dust when their have casemates were collapsed as much as the two.

Steel-and-concrete fortifications saw a revival when you took a Nineteenth & early Twentieth centuries, nevertheless a advances around modern warfare since World War I have made prominent-shell fortifications obsolete inside virtually all situations. Merely underground bunkers are however entity to provide a bit of protection within modern wars. Numerous historical fortifications were demolished in the period of the modern age, however a considerable total hold out when popular tourer destinations & large local landmarks today.

A recent trend towards gated communities in the United States and elsewhere has been called the link to of fortifications by a select few.

Examples
List of fortifications List of forts