After defeating Harald Hardrada and Tostig, Harold left much of his army in the north, including Morcar and Edwin, and marched the rest south to deal with the threatened Norman invasion. He probably learned of William's landing while he was travelling south. Harold stopped in London, and was there for about a week before marching to Hastings, so it is likely that he spent about a week on his march south, averaging about per day, for the distance of approximately . Although Harold attempted to surprise the Normans, William's scouts reported the English arrival to the duke. The exact events preceding the battle are obscure, with contradictory accounts in the sources, but all agree that William led his army from his castle and advanced towards the enemy. Harold had taken a defensive position at the top of Senlac Hill (present-day Battle, East Sussex), about from William's castle at Hastings.