howmany archers where there? Let's say 2000 archers (probably wrong)
If you, with great armour and stuff, have to run across a muddy field, while you know that roughly 2000 arrows will come down at you every 12 seconds?
You have heard horrid tales of kings getting shot, and how accurate some archers are.
You know that it's luck based if you don't get hit, and that if you get hit and fall (not die) you will get trampled by your brothers in arms and drowned in mud.
And you know that when you reach their lines there will be fresh english knights and footmen who slaughter you while you are exhausted from dragging your entire equipment trough a muddy mess, continously holding your shield up?