Charles VI: Minority, Madness, and Civil War (1380–1422) · HIGH MIDDLE AGES
Civil war weakened the state: divided armies, captured finances, incoherent decisions. England exploited this fragility. Under Henry V, the Hundred Years’ War took on a new intensity.
In 1415, the battle of Agincourt was a military and political catastrophe for France. Beyond the losses, it showed the disorganisation of a kingdom in which power was disputed and the king could not guarantee stable direction.
After 1415, the English advanced and progressively seized Normandy. To hold Normandy was to control a wealthy territory close to England, and to open a corridor of pressure towards Paris.