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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 such as curtain walls with towers, bastions and gates for access to the city. [1]
Double apron fence A snow-covered obstacle with concertina wire. In the military science of fortification, wire obstacles are defensive obstacles made from barbed wire, barbed tape or concertina wire. They are designed to disrupt, delay and generally slow down an attacking enemy.
A mid-19th century artillery casemate at Fort Knox, Maine.. A casemate is a fortified gun emplacement or armoured structure from which guns are fired, in a fortification, warship, or armoured fighting vehicle.
Map of St. Clement's Retrenchment between the Santa Margherita Lines and the Cottonera Lines in Cospicua, Malta. Retrenchment is a technical term in fortification, where it is applied to a secondary work or series of works constructed in rear of existing defences to bar the further progress of the enemy who succeeds in breaching or storming these.
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Fort Amsterdam, the quadrangular structure (left) in this 1660 image stood at the southern tip of Manhattan Island, defending New Amsterdam Fort Norfolk in 1861, a first system fort upgraded as part of the second system The Statue of Liberty is built on top of Fort Wood of the second system Fort Adams, one of the largest third system forts
The islands of Malta, Gozo and Comino all have some form of coastal fortification. The area around the Grand Harbour was possibly first fortified during Arab rule, and by the 13th century, a castle known as the Castrum Maris was built in Birgu to protect the harbour.
The castle was constructed from stone with angular bastions. Its design was a hybrid of Italian and English military designs. The site was raided by a French force while the fortification was still being constructed. The castle suffered from coastal erosion and was demolished in 1631. [46] Sharpenrode Bulwark: Freshwater