Final answer:
The incorrect statement about the Hundred Years' War is that traditional nobles fighting on horseback were the keys to victory; instead, the war featured the rise of infantry and new military tactics.
Step-by-step explanation:
All of the following regarding the Hundred Years' War are correct except for the statement that states traditional nobles fighting on horseback were the keys to victory.
Indeed, while the English were victorious at the battles of Crécy and Agincourt, and weapons such as the longbow and gunpowder played significant roles, the war was marked by the declining importance of cavalry.
The conflict, fought between England and France, saw the emergence of new military technologies and tactics that made the traditional mounted knight less effective.
Although Joan of Arc was indeed burnt at the stake for heresy by the English, the statement about traditional nobles being the key to victory is not correct, considering the emphasis on foot soldiers, longbowmen, and later, firearms over the mounted knights.
The Hundred Years' War was fought between England and France from 1337 to 1453. While the English were victorious at the battles of Crécy and Agincourt, this war ultimately left France in control. Joan of Arc was actually burnt at the stake for heresy by the English, not the French.
Additionally, the traditional nobles fighting on horseback were not the keys to victory in this war; the use of new weapons and tactics, such as the English longbow and gunpowder, played a key role in disrupting the importance of the cavalry.