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However, during World War II, the need for secrecy forced allies and enemies alike to develop their own various forms of encrypted communication. ... They included traditional practices such as placing spies and sending trained carrier pigeons, as well as newer electronic encryption systems.

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WWII spies use maps because they didn't or couldn't use any type of GPS. to hide there maps the hide them in cards, handkerchiefs,and many other things.

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Inside The True Story Of WWII’s Most Decorated Spy | TODAY

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From pacifist to spy: WWII’s surprising secret agent - Shrabani Basu

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Dozens of women were recruited by the SOE and deployed as spies, including American agent Virginia Hall and Indian-British radio operator Noor Inayat Khan.

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Agents of SOE were tasked with gathering intelligence, carrying out acts of sabotage, and building up and supporting local movements such as the French Resistance. They also took part in manoeuvres supporting specific military objectives.

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Spies had many gadgets. such as knifes hidden in shoes, playing cards used as maps, and gills meant for under water breathing.

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during world war ll there were 24,000 spies and they did many things.