The struggle to breach Ely and the tactics employed by William's army

Despite the military backing of England and Normandy, William's army faced significant challenges in breaching Harroward's fortress on Ely. The island's location amidst fens created difficulties for the Normans, as Harroward and his army were more familiar with the terrain. The Normans attempted to find easier crossing points, but Harroward's army had already established fortifications in strategic locations, making it harder for the Normans to penetrate. Multiple failed attacks resulted in catastrophic losses for the Normans, including casualties like William Mallet, who may have met his end in the swamps of East Anglia.