Harold had originally been expecting an attack from William, Duke of Normandy on the Isle of Wight, but when no attack came, he was forced to dismantle his army because of maintenance costs. Then, he heard of the invading Vikings from the north that had taken the town of York. He immediately re-assembled his army and rushed north, reaching the vikings in a mere four days.
The Vikings were completely unprepared by the Saxons sudden appearance. Without their armour, they were massacred by the English. Many fled across Stamford Bridge, a thin wooden bridge at the time. One particularly large Norseman held the bridge, apparently killing over 50 Saxon soldiers single-handedly. His demise came when a cunning Englishman floated underneath the bridge and stabbed the Norseman in the groin area. Once he was dead, the Saxons pressed on past the bridge to find the vikings also employing the trademark shield lock technique. In response, the Saxons also locked their shields. Now it was a matter of strength, and without their armour the vikings were no match for the English. As the Saxons attacked, chinks started appearing everywhere in the Norse shield wall.
The survivors agreed to a truce with King Harold never to attack England again and so the last invasion of the Norse into England ended.