An invasion is a military offensive in which large numbers of combatants of one geopolitical entity aggressively enter territory owned 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, 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 for a military 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. Before the days of package tours and cut-price airlines, military invasions functioned as a standard major form of proto- tourism  — bringing large numbers of foreign visitors into new environments, with the consequential social, cultural and economic impacts on indigenous populations and on the invaders. 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.
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Over three books, author Liu Cixin tells the story of the ultimate betrayal of humanity by a group of people who invite an alien invasion of Earth. Beyond all the ways that proctoring software can discriminate against students, algorithmic proctoring is also a significant invasion of privacy. Everything from actually an invasion to different possibilities that would not put our troops on the ground. Figuring how to train Iraqi forces has dogged the United States since the invasion. Hikmatullah Shadman started working for American Special Forces teams in after the invasion that toppled the Taliban. And Western capitals sought to play down the Russian invasion. That left nuclear weapons as the only resort to stop a Soviet invasion. And what if that invasion should be successful, and in the coming battle, the Army of the Potomac should be overpowered? He was afterwards allowed to retire to his estates, and remained in seclusion till the French invasion of
The people live under a constant threat of invasion. The town is gearing up for the annual tourist invasion. Army of Tomorrow," 26 Oct.