invasion is a military offensive in which large parts

Invasion Resources An invasion is a military offensive in which large parts of combatants of one geopolitical entity aggressively enter territory controlled by another such entity generally with the objective of either conquering liberating or re-establishing control or authority over a territory forcing the partition of a country altering the established government or gaining concessions from said government or a combination thereof. An invasion can be the cause of a war be a part of a larger strategy to end a war or it can constitute an entire war in itself. Due to the large scale of the operations associated with invasions Buy Invasion Points Buy Invasion Gold they are usually strategic in planning and execution.

Archaeological evidence indicates that invasions have been frequent occurrences since prehistory. In antiquity before radio communications and fast transportation the only way to ensure adequate reinforcements was to move armies as one massive force. This by its very nature led to the strategy of invasion. With invasion came cultural exchanges in government religion philosophy and technology that shaped the development of much of the ancient world.

States with potentially hostile neighbors typically adopt defensive measures to delay or forestall an invasion. In addition to utilizing geographical barriers such as rivers marshes or rugged terrain these measures have historically included fortifications. Such a defense can be intended to actively prevent invading forces from entering the country by means of an extended and well-defended barrier; the Great Wall of China Hadrian's Wall and the Danewerk are famous examples. Such barriers have also included trench lines and in more modern times minefields cameras and motion-sensitive sensors.[2] However Invasion Points these barriers can require a large military force to provide the defense as well as maintain the equipment and positions which can impose a great economic burden on the country. Some of those same techniques can also be turned against defenders used to keep them from escape or resupply. During Operation Starvation Allied forces used airdropped mines to severely disrupt Japanese logistical operations within their own borders.
View from Dover Castle.

Alternatively the fortifications can be built up at a series of sites such as castles or forts placed near a border. These structures are designed to delay an invasion long enough for the defending nation to mobilize an army of size sufficient for defense or in some cases counter-invasion—such as for example the Maginot Line. Forts can be positioned so that the garrisons can interdict the supply lines of the invaders. The theory behind these spaced forts is that the invader cannot afford to bypass these defenses and so must lay siege to the structures.
The view from a battery at Ouvrage Schoenenbourg in Alsace; notice the retractable turret in the left foreground.

In modern times the notion of constructing large-scale static defenses to combat land-based threats has largely become obsolete. The use of precision air campaigns and large-scale mechanization have made lighter more mobile defenses desirable to military planners. The obsolescence of large fortifications was displayed by the failure of the Maginot Line in the beginning of World War Two. Nations defending against modern invasions normally use large population centers such as cities or towns as defensive points. The invader must capture these points to destroy the defender's ability to wage war. The defender uses mobile armored and infantry divisions to protect these points but the defenders are still very mobile and can normally retreat. A prominent example of the use of cities as fortifications can be seen in the Iraqi Army's stands in the 2003 invasion of Iraq at Baghdad Tikrit and Basra in the major combat in the Iraq War. A defender can also use these mobile assets to precipitate a counteroffensive like the Soviet Red Army at the Battle of Kursk or the Northern Alliance in Afghanistan.

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