“Consider the time involved in making an arrow by hand in those times then think again about those numbers.”
They were on a military campaign so the arrows were already made. I don’t know how many arrows were shot, but the archers did run out at one point and have to go pick up arrows from the battlefield.
Agincourt is one of my favorite battles to study. Henry V was a military genius and the French obliged with their stupidity.
Bernard Cornwell wrote a good historical fiction book about an archer in the military campaign.
http://www.amazon.com/Agincourt-Bernard-Cornwell/dp/0061578908
It was said that the initial French charge was met by 75,000 arrows in one minute. The archers must have had to release one arrow before the previous one landed. They didn’t need much accuracy, they were firing into a mass of horsemen. A horse struck by an arrow became uncontrollable, some turned around and drove into masses of French men-at-arms following behind the cavalry. The longbow was employed by both sides at Agincourt, but the French bowmen were said not to have played much of a role.
The weather and battle site selection helped too. War horses carrying heavily armored knights didn’t do well in a deep, sticky, muddy farmer’s field after a full night’s deluge, and near stationary targets under masses of bodkin tipped English arrows made for a slaughter. The cream of the French nobility was nearly wiped out. Considering the relative size and condition of Henry’s army the English had good reason to call the victory miraculous, but it was a combination of providence and stratagem.