The 100 years War had been indeed a protracted conflict which, at different stages, included the Kingdom of England for that reason Kingdom of France. It began, for hereditary reasons, in 1337 and have been battled on French territory. It marked a decisive turning point in army strategy and practices. Through century War the Heavy French cavalry ended up being certainly the queen concerning the battlefield. But because the very first phases related to war, the French military were defeated by the English Troops, well competed in using longbows and infantry, in battle of Crecy, Poitiers and, in 1415, Azincourt. But from 1429, as a result of the leadership of Joan of Arc through the siege of Orleans, the French troops discovered once again ethical and commitment. The a century War completed in 1453 as a result of very nearly complete control regarding the nation by the Kingdom of France.