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Post script ... this correction was sent to us for the edification of our readers:
Your article above is incorrect both in the use of the index finger as an insult and the origin of the "F" word.
In England the use of two fingers extended, palm inwards is used as an insulting gesture, not to be confused with Winston Churchill's similar gesture with palm facing out as a sign of victory.
Longbows of the time (1415 Agincourt) were too powerful and could not be drawn with just the index finger alone, the bowman had to use two fingers hence supposedly waving two fingers at the French.
However the use of the index finger alone as an insulting gesture is popular in England but has its origin in the USA.
The use of the "F" word goes back to Anglo Saxon times which of course predates William Duke of Normandy (Battle of Hastings 1066).
Also from Wikipedia, the free encyclopedia:
An early recorded use of the 'two-fingered salute' is in the Macclesfield Psalter of c.1330 (in the Fitzwilliam Museum, Cambridge), being made by a glove in the psalter’s marginalia.According to a popular legend the two-fingers salute and/or V sign derives from the gestures of longbowmen fighting in the English army at the Battle of Agincourt (1415) during the Hundred Years' War. The story claims that the French claimed that they would cut off the arrow-shooting fingers of all the English longbowmen after they had won the battle at Agincourt. But the English came out victorious and showed off their two fingers, still intact. Historian Juliet Barker quotes Jean Le Fevre (who fought on the English side at Agincourt) as saying that Henry V included a reference to the French cutting off longbowmen's fingers in his pre-battle speech. If this is correct it confirms that the story was around at the time of Agincourt, although it doesn't necessarily mean that the French practised it, just that Henry found it useful for propaganda, and it does not show that the 'two-fingers salute' is derived from the hypothetical behaviour of English archers at that battle. Indeed, there is no record of this explanation for the V sign before the 1970s.