"The Conqueror's men were frustrated in their efforts to capture 'Hereward the Wake' for over a year. In 1070 he and his men made a daring raid on the monastery at Peterborough which marked him as a dangerous and effective resistance leader. William and his army gradually closed on Hereward until he withdrew to the Isle of Ely where he lived in comfortably - out of reach of the invading force."