On July 17, 1453, the Battle of Castillon was fought…
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While usually described as the last battle of the 100 Years War, the war did not formally end until the Treaty of Picquigny in 1475. England's Yorkist King Edward IV allowed himself to be bought off and dropped his claim to the French throne in return for hard cash.
The view that the 100 Years War ended in 1453 is also rather spoiled by the French raid on Sandwich in Kent in 1457, two years after the start of the Wars of the Roses in England.
Wiki says:
"On 28 August 1457… (). The French took advantage of the situation by sending a raiding party to Kent, burning much of Sandwich to the ground.
A force of around 4,000 men from Honfleur, under the command of Pierre de Brézé, Marshal of France, came ashore to pillage the town, in the process murdering the mayor, John Drury. It thereafter became an established tradition, which survives to this day, that the Mayor of Sandwich wears a black robe in mourning for this ignoble deed."
Being a property owner in Sandwich was a little precarious as the town was also twice raided by Yorkist forces from English-held Calais in this same period. Both times the Lancastrians were defeated and suffered losses, with more than a little suspicion that the pro-Yorkist townsfolk of Sandwich had helped the Yorkists with the raids or had even let them in or led them in.
Barry