The excellent - and ale-erific - Michael in Halifax includes this fact in a post today:

At the battle of Towton in 1461 - Britain's bloodiest battle - the Yorkist faction had as many as 20,000 archers. At 15 arrows per minute that's 300,000 arrows per minute - 5000 arrows per second. 28,000 died. Nothing came close to this killing score until the First World War.