Swein Estrithsson of Denmark
arrived with his fleet and made
an alliance with local
The rebels, led by Hereward
the Wake with his new Danish support, launched a raid on Peterborough
However, King William soon made an
agreement with the Danes and they sailed home. King William realised
that without Danish support, the rebels weren't very strong.
William sent Norman forces to attack
Ely, but they weren't ready for the marshland.
Unable to find their way, many Normans slowly drowned.