Let us turn back time.
Henry VI was the last king of the House of Lancaster. He ascended the throne nine months after his birth. When his maternal grandfather, Charles VI of France, died, the English almost unilaterally declared him King of France under the Treaty of Troyes signed by Henry V and Charles VI. His two uncles served as regents in Britain and France respectively: Humphrey, Duke of Gloucester, in Britain, and John, Duke of Bedford, in France.
Henry VI was not as willful as Caligula, but people still considered him too weak. The king's chief ministers often quarreled disgracefully, and their disputes concerned the worsening rule of France.
His father, Henry V, was nicknamed the Hammer of the Gauls. The Hundred Years' War between Britain and France was not fought continuously; there were three "halftimes." The third "halftime" came during Henry IV's reign. Shakespeare condemned him in his writings because his rule achieved nothing. He was beset by rebellious nobles and an ailing body, lacking such knightly qualities as brilliance and vigor.
After Henry V took the throne, he reignited the war. This time, France fell into internal conflict. At the Battle of Agincourt, under Henry V's command, Britain's army, primarily infantry archers, crushed a large elite force composed of nobles from France, laying the foundation for the subsequent conquest of all Normandy in 1419.
Although many regarded this battle as the most glorious victory of Britain's longbowmen, and it profoundly influenced later tactics of using firepower at range to destroy densely packed enemy formations, it had rained for a long time before Agincourt. The battlefield lay beside farmland plowed by peasants, and such soft ground was unsuitable for heavy cavalry charges. With armored knights on horseback and the weight of the horses themselves, once their hooves sank