From 1337 to 1453 England repeatedly invaded France on the pretext that her kings had a right to the French throne. Though it was a small, poor country, England for most of those “hundred years” won the battles, sacked the towns and castles, and dominated the war. The protagonists of the Hundred Years War are among the most colorful in European history: Edward III, the Black Prince; Henry V, who was later immortalized by Shakespeare; the splendid but inept John II, who died a prisoner in London; Charles V, who very nearly overcame England; and the enigmatic Charles VII, who at last drove the English out. In battle after battle, French knights were mowed down by English longbowmen who fired arrows capable of piercing armor. By war’s end, knights were obsolete thanks to English longbows and guns. Castles proved worthless because cannons could take down their walls. The entire feudal system broke down as people developed loyalties to their countries rather than their local lords. I thought that I would highlight the military tactics and changes in weapons that occurred during the course of this war.