For how many years was the hundred years war fought?
Joan of Arc was in the Hundred Years War because she was born in France in 1412 during the Hundred Years War. If you are asking why she fought in the Hundred Years War it is because she believed she was given a Mission from God to drive the English out of France and return Charles VII to the Throne of France.
the hundred years war was fought on the land and on the farms, because of that many farms were destroyed and they had two losses destruction of the land and the loss of resources. there were also many cities destroyed the taxes in France and England were raised due to the war expenses, and caused a revolt from the citizens. Joan of Arc did a lot of helping in it as well.