How do Defenders work?

When an enemy invades your Empire, the game automatically defends the empire with three units or appropriate level chosen at random. You can affect which units are selected for this process using Defenders.

When you place a unit on your island, a blue square appears around the unit. Any building that overlaps the blue square is considered to be “defended” by that unit. When the invader targets those buildings, the game will automatically defend them with the units you have nearby on the board, plus three randomly chosen units. You can increase the total number of units defending as high as five this way.

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