Harold stopped in London, and was there for about a week before Hastings, so it is likely that he spent about a week on his march south, averaging about 27 mi (43 km) per day, for the approximately 200 mi (320 km).

The exact numbers present at the battle are unknown as even modern estimates vary considerably. The composition of the forces is clearer: the English army was composed almost entirely of infantry and had few archers, whereas only about half of the invading force was infantry, the rest split equally between cavalry and archers. Harold appears to have tried to surprise William, but scouts found his army and reported its arrival to William, who marched from Hastings to the battlefield to confront Harold. The battle lasted from about 9 am to dusk. Early efforts of the invaders to break the English battle lines had little effect. Therefore, the Normans adopted the tactic of pretending to flee in panic and then turning on their pursuers. Harold's death, probably near the end of the battle, led to the retreat and defeat of most of his army.