After Charles VII's successful Normandy campaign in 1450, he concentrated his efforts on Gascony, the last province held by the English. Bordeaux, Gascony's capital, was besieged and surrendered to the French on 30 June 1451. Largely due to the English sympathies of the Gascon people, this was reversed when John Talbot and his army retook the city on 23 October 1452. However, the English were decisively defeated at the Battle of Castillon on 17 July 1453. Talbot had been persuaded to engage the French army at Castillon near Bordeaux. During the battle the French appeared to retreat towards their camp. The French camp at Castillon had been laid out by Charles VII's ordnance officer Jean Bureau and this was instrumental in the French success as when the French cannon opened fire, from their positions in the camp, the English took severe casualties losing both Talbot and his son.
Question: The English were defeated at the Battle of Castillon how many years after Charles VII's successful Normandy campaign?
Answer: 3