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Fortress Gates are a barrier meant to block enemy troops from passing through while allowing friendly troops to enter, and is usually coupled with walls as an effective defense.

Gates have two variants; one that faces horizontally (east/west) and one that faces vertically (north/south).

GDI and Nod use different models of gates, although their statistics are similar to each other, like walls.

Official description

This structure prevents enemy units and Tiberium growth from entering a base. The gate automatically opens to allow friendly units to pass, but will not open for enemy units.[1][2]