The big "change" ...

With the invention of the printing press and - as a consequence - the distribution of information in masses (by then already mostly in the shape of propaganda), propaganda could change its methods. It could not only be produced but also reproduced and therefore spread widely.
The Protestant Reformation profited by this. The idea of translating the Bible into local languages was successful, because it got possible for many people to get a Bible, as books no longer were affordable only for the nobles and the Church.

Royalty and the Courts realized that prestige asked for propaganda and that it was impossible to reign over the people if their mood turned against the king. This gave the impetus for acting. Pamphlets were used for spreading royal messages; like the so-called "mazarinades" (Taylor, Munitions of the Mind, p. 122), written in a very simple language and spread periodically and in big numbers.
When - in 1896 - newspapers started being distributed in huge amounts, the access to propaganda and disinformation was opened extremely. Newspapers informed the mass - and disinformed them if it was considered as necessary (e.g. in war-times).
From that time on propaganda and manipulation were carried out for the most different political ideas and nearly without frontiers. Censorship - a part of disinformation - seems to have been the only barrier then. Sometimes even the source of a message kept hidden, which was part of the disinformation process. It is easier to spread ideas against somebody if the own name is kept hidden; and speaking out some kind of laudation that the own party is better without mentioning that it was oneself who spread it and therefore claim that it was someone else who praised the very idea.

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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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