Invasion is one of the possible weekly challenges and consists of a single campaign broken up into a number of missions, usually split evenly between normal and expert difficulty. By completing the missions in the campaign you earn cash, experience, progress along the reward list, and units just like you would receive in a normal campaign mission. Progress along the reward list can be sped up by completing achievements within the campaign, for example by destroying 300 enemy air support which yields 8000 points.

List of Invasion Campaigns:

Snake River Nest

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