I have just been scanning through a number of descriptions of Hundred Years War battles over at Wikipedia (so not necessarily 100% accurate), and as I expected it seems that in no cases were dismounted men-at-arms sent against archers. However, in later years the French did start to perfect the tactic of charging the English archers with heavy cavalry – for instance at the Battle of Patay decisively, and at the Battle of Vernuil with partial success. The key seems to have been heavy armour for the horses, sufficient numbers and disciplined charges.