Spies were deployed directly in battle for the first time 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. 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. The spy was also used as a sabotage unit to wreak havoc in enemy bases. 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.