PATAY 18 June 1429.
Patay was to the French what Agincourt was to the English. It turned into a disaster and a rout that claimed half the English Army through a mistake in the defences of the Longbow men. It was an almost reverse of Agincourt enabling the French heavy horse to utterly grind up the Archers who had only attained a half baked defence that the French Cavalry swept aside.
See
http://www.longbow-archers.com/historypatay.html
From the above reference I Quote"The English position was therefore not fully consolidated by the time it was attacked. Protection offered by the terrain was minor and crucially for the longbow men there were no features that protected the flanks. All the basic ingredients of a well-protected position that had been so visibly present at Crécy, Poitiers and Agincourt, were absent at Patay".Unquote.
See also
https://www.thoughtco.com/aftermath-...rs-war-1221904