I think the point was shock/goad the French into an ill-considered charge. Look at how pissed that horde is on the last page. I think the goal was to shock the enemy into a rush with a weapon that was pretty disposable. Historically, this was a tech battle - english longbows vs. french crossbows. What really beat the french here was the massed english longbows here, and I guess the king knows this, and wants a horde of french charging headlong into longbow range.