pluck yew!
https://www.storypick.com/middle-finger-origins/
This is my FAV...
The derogatory remark 'Fuck you', is also said to have started from this Battle of Agincourt.
The French threatened to cut Englishmen's fingers so that they could not Pluck their yew. So, when they failed to do so, they started mocking the Frenchmen and showing the finger and yelling that look, we can still pluck yew; over time, Pluck yew became the now-used fuck you along with the finger.
More...at the time...the English longbow was much superior to any in the world. Due to the wood, it was made.
The ancient Romans called the middle finger the digitus impudicus or indecent finger. The finger stood symbolically for the penis, while the two fingers on the either side represented the testicles. It is believed that Romans acquired this gesture from the Greeks. Link (https://www.storypick.com/middle-finger-origins/)
A Fuck you finger.jpg