Iron Curtain (Red Alert 1)

The Iron Curtain is a Soviet superweapon capable of making a unit temporarily invulnerable. It features in Red Alert 1. The device shares its name with the colloquial name for the territorial border that separated the western and eastern hemispheres during the Cold War.

Background
The Iron Curtain is based on the theory of resonating molecules under certain frequencies. The device consists of an underground generator and an above ground transmitter, suspended above a circular opening directly above the underground machinery. The transmitter collects energy (sent via the circular opening in the form of a semi-transparent white stream of particles, gradually beginning to glow red. Once enough energy is collected, it can coat the target vehicle with the Iron Curtain effect, making it impervious to harm for a short amount of time.

It was upgraded to sheath more units during the Third World War.

Allied reaction
Given the potential damage such a technology might cause to the Allies, General Von Esling personally dispatches several missions to recover intelligence on the project and destroy research facilities. However, due to redundant research centers, the project yields working prototypes in spite of Allied actions and two of these devices are deployed in defence of Moscow. Nevertheless, the Allies were successful in stopping the development of a more powerful variant of the Iron Curtain.