Then when Sir Mordred wist and understood how he was beguiled, he was passing wroth out of measure. And a short tale for to make, he went and laid a mighty siege about the Tower of London, and made many great assaults thereat, and threw many great engines unto them, and shot great guns. But all might not prevail Sir Mordred, for Queen Guenever would never for fair speech nor for foul, would never trust to come in his hands again.