After William won the battle of Hastings he had to make sure he was in control of his new kingdom.  He did not march on London.  He had to make sure he had enough support.

He went to Dover and then Canterbury to begin taking control.   He only marched on London when he was sure he could cope with any resistance. As can be seen from the map, William and his army approached London from the north.

William ordered his army to burn the countryside as they got near to London.  This was a warning to the people - he wanted to show it was not worth fighting him.

The English leaders (many members of the Witan), came out to meet him and surrendered.  They promised to support William.

William was crowned King of England on Christmas Day 1066.