Now, by about 10:00 or so, Henry got rather tired of waiting for the French to figure out what they were going to do, so he had his archers move up on the field, so as to be closer to the French. There, they set up their stakes that they used to defend themselves against cavalry charges, and loosed a few flights of arrows at the French. At that point, the French broke out in a completely disorganized charge towards the English, across this sea of mud, and straight into the stakes that the English archers had set up.
IMO, the role of the longbow is somewhat overblown, particularly by English historians. It will penetrate armor nicely, but it has to be done at fairly close range to do so. The real culprit at Agincourt was the French arrogance and disorganization. But, what goes around comes around - a generation later, the French would have much more success against the English...