The United States Department of Defense defines a denied area as "an area under enemy or unfriendly control in which friendly forces cannot expect to operate successfully within existing operational constraints and force capabilities."
When a reference is made to a friendly force denying an area to the enemy, such as a reference to friendly forces employing area-denial weapons, the intent is to create an area in which the enemy cannot operate without extreme risk.
Land mines can be used as area-denial weapons, and some modern semi-autonomous or remotely-controlled artillery units can serve this purpose as well. In theory, nuclear, biological, and chemical weapons can also serve this purpose, for varying lengths of times, though such weapons have not yet been used for this purpose in major wars, although such weapons have been used for other purposes.
It's important to realize that some effective tactics for creating a denied area do not require a significant continuing commitment of personnel or additional material. For example, once a minefield is in place, no upkeep is required unless a significant percentage of the mines have been detonated or destroyed—no residual force commitment is required. This is why a denied area may well exist behind enemy lines when, if it were secured by friendly forces on the ground, it might be considered a forward position. However, it's equally important to realize that, when hostilities end, these areas can be very dangerous and expensive to clean up, assuming that one of the combatants is willing to. (see UXO, bomb disposal, land mine, and the contamination concerns for unconventional weapons).
A dirty bomb is a potential option for an area denial weapon that might be more accessible to small paramilitary or terrorist groups.
Famous quotes containing the words denied and/or area:
“Thales claimed that everything was water. He also put wine into water to sterilize it. Did he really believe he was putting water into water to sterilize it? Parmenides, like most Greeks, knew that wine was not water. But while lifting a glass of wine to his lips, he denied that motion was possible. Did he really believe that the glass was not moving when he lifted it?”
—Avrum Stroll (b. 1921)
“Many women are reluctant to allow men to enter their domain. They don’t want men to acquire skills in what has traditionally been their area of competence and one of their main sources of self-esteem. So while they complain about the male’s unwillingness to share in domestic duties, they continually push the male out when he moves too confidently into what has previously been their exclusive world.”
—Bettina Arndt (20th century)