Command & Conquer: Red Alert: Counterstrike is the first of two expansions for Command & Conquer: Red Alert, released in 1997 with some new missions for both the Allies and the Soviets. It was the first expansion pack to bring new units, however they were campaign only. Arguably, the main feature of this expansion was the four secret Ant missions complete with a new "faction" of enemies, the Giant Ants.
Includes 16 new single player missions and many new multiplayer maps from the original designers of Command & Conquer: Red Alert.