On the other hand, Yuri used his mind-control units and towers (including the psychic radar) to detect spies. The Allies did the same with their own dogs, in the case of being targets of rogue or mind-controlled spies. The Soviets were not ignorant of the Allies' use of the spy and trained attack dogs to differentiate the scent of base personnel and if they noticed a strange smell among the Soviet men, they would attack and kill the Allied spy.
Spies were vital to the Allies' victory, especially during Operation: Dark Night, where they were a key element in sabotaging two nuclear missile silos in Soviet-controlled Poland. A spy would disguise himself as an enemy soldier to pass unnoticed to most other units and infiltrate buildings, sabotaging them or stealing enemy resources and technologies from them. The spy was also used as a sabotage unit, unlike their predecessors. The deployment of battlefield spies by the Allies continued during Third World War and its second iteration, providing Allied commanders with valuable information about plans and vulnerabilities of Soviet and Yuri bases.
Spies were deployed directly in battle by the Allies during the Second World War, though usually they were used as intelligence gathering operatives behind enemy lines or in enemy command centers and bases.
