One of the most fascinating things discovered is the use, by the English, of the long bow. For a period of time the long bow changed how battles were fought and strategies set.
Somewhat ironically, the long bow also helped hasten the end of the chivalric code in the battles of medieval Europe as projectiles rather than hand to hand fighting with swords etc. became of vital importance.
Projectiles, of a kind, continue in this matter to this day. However, gun powder saw the end of the effectiveness of the long bow
ALSO- Edward III big moments. He likened himself to King Arthur and for a good while, he did a great job at it. He won the two battles discussed here and was always great at jousting tourneys.
After Crecy, it is his son Edward of Woodstock, who has the next great victory for the English over the French
Finally, in old age, Edward, who up to this point was more similar to his grandfather, Ed I, ends up being more like his dad, Ed II, by letting a favorite, in Ed III's case- Alice Perrers, run the roost
Enjoy!