The 100 years war and Joan of Arc. Warm Up: How could a single person effect a war?. Late Middle Ages. Plague, economic crisis , and the decline of the Catholic Church were not the only problems of the late Middle Ages. The 100 Years’ War was the most violent struggle during this period. .
Warm Up: How could a single person effect a war?
The French relied on heavily armed noble cavalry men. The English did as well, but relied more on large numbers of paid peasant foot soldiers.