World War I ...

With World War I an entire system of ideas how wars work collapsed. Suddenly it was no longer mostly soldiers who had to fight. War became an engagement of every day's life. Everybody got involved.
Propaganda therefore changed as well. The campaigns were no longer temporarily and recent but had to be planned for years. Who failed in organizing it or used the wrong keywords failed. Masters of modern propaganda became the British, whereas the Germans failed completely in the beginning.

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Themistocles

Themistocles, a Greek politician and general, conquered the Persians in the battle of Salamis, in 480 BC. The Persians, under their King Xerxes, who were on the edge of winning the battle, got defeated by a propaganda campaign that Themistocles launched, telling the Persians that he was on their side and willing to let them win the battle; his argument was that the Greek were so busy with their quarrels that they were not prepared to fight an aggressive battle and a lot of them would change sides if the power of the Persians was shown in a short and cruel fight. In the end Xerxes got the message that parts of the Greek army were fleeing the battlefield. This disinformation lead to a wrong assessment of Xerxes, which made it easy for the Greek to win the war.

For further details see:
http://www.optonline.com/comptons/ceo/31900_Q.html

http://ds.dial.pipex.com/kitson/ESSAYS/Them.htm

http://www.eptonline.com/comptons/ceo/31900_Q...
http://ds.dial.pipex.com/kitson/ESSAYS/Them.h...
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