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Interior lines [a] (as opposed to exterior lines) is a military term, derived from the generic term line of operation or line of movement. [1] The term "interior lines" is commonly used to illustrate, describe, and analyze the various possible routes (lines) of logistics, supply, recon, approach, attack, evasion, maneuver, or retreat of armed forces.
The Middle Line of defence ran from Braefoot Battery in the North to a battery on Cramond Island in the South, with fortified gun emplacements on the islands of Inchcolm and Inchmickery. The Inner Line of defence was situated close to the Forth Bridge, with batteries at Downing Point on the North coast and Hound Point on the South coast of the ...
A QF 4.7-inch gun at Fort Peninsula, Quebec, the type of gun initially mounted at Downing Point. The Downing Point Battery incorporated two gun emplacements, each was initially equipped with a QF 4.7-inch Mk I – IV naval gun, designed to engage enemy surface vessels threatening ships at anchor in the Firth of Forth and the naval facilities at Rosyth Dockyard.
A section of the Mannerheim Line. The flexible defense is a military theory about the design of modern fortifications.The examples of "flexible" defense-lines (Mannerheim Line, Árpád Line, Bar Lev Line) are not based on dense lines of heavily armed, large and expensive concrete fortifications as the systems such as the Maginot Line were.
The Maginot Rhine defenses employed three lines of defense, with blockhouses or casemates close to the Rhine (the first line), backed by infantry shelters (the second line). The third line was a strong series of casemates, built on the model of interval casemates in the northeastern sections of the Line, but without lower levels.
A main line of resistance (MLR) is the most important defensive position of an army facing an opposing force over an extended front. It does not consist of one trench or line of pillboxes , but rather a system, of varying degrees of complexity, of fighting positions and obstacles to slow enemy advances.
In Zaporizhzhia Oblast, Russia constructed roughly three lines of defense: a 150 km (93 mi) long frontline from Vasylivka to Novopetrykivka on the Zaporizhzhia–Donetsk oblasts border, a 130 km (81 mi) long second line of defense from Orlynske to just north of Kamianka, and "a constellation of disconnected fortifications surrounding larger ...