So anon as Sir Launcelot had warning he was soon ready; and there Sir Percivale and Sir Launcelot encountered with such a might, and their spears were so rude, that both the horses and the knights fell to the earth. Then they avoided their horses, and flang out noble swords, and hewed away cantels of their shields, and hurtled together with their shields like two boars, and either wounded other passing sore. At the last Sir Percivale spake first when they had foughten there more than two hours.

Malory's Le Morte d'Arthur