Winds were coming down from the north, keeping William in France. Harold waited on the English coast. Eventually, he began running out of supplies for his troops and disbanded his army. But these winds took Harald, assisted by Tostig Godwinson (Brother of Harold Godwinson), down to the Shetlands, Orkneys and, finally, North England. The vikings set up camp and pillaged York for food, water and supplies.
Two earls, Morcar of Northumbria and Edwin of Mercia, went north to meet Harald, at Fulford. The battle was in a marshy stream. The armies stood on either side, staring the enemy down. The stream cleared and the armies charged. Sword and spears impaled the enemy. The Vikings and Saxons(English) reported that Morcar was a brave leader fending off every viking in his way, and soon did Harald. Harald was in the reserve. He ordered the reserve to come from behind and attack the Saxons. He killed everyone in his path. When Harold received the information, he traveled from London to York, gathering his army on the way.
Good info.