When King Edward The Confessor died, a war broke out for the vulnerable throne...
The new king, Harold Godwinson, destroyed the Norwegian force by killing both it's leaders, King Harald Hardrada and Tostig Godwinson. They had defended themselves from the Norwegians in the North but still had to fend for themselves from the Normans in the South.
After the battle, King Harold's troops were fatigued. While the English troops were resting King William of Normandy attacked England from the South.
The English army, expanding as they marched, reached the battlefield on 28 September 1066 finding a stronger army than them at the bottom of the hill. They had a very good defense and all the Norman troops were getting tired running up the hill and attacking the opponent's 'impenetrable' defense. Thus started the battle of Hastings
Eventually the Normans found a loophole and separated the English by baiting them into following them so that they could eliminate the troops that followed them one by one. After all the troops with shields were killed, they defeated the English army with ease.
On Christmas day, 1066 William of Normandy was crowned king of England.
He had created a monastery at the site of the battle but there continued to be many rebellions and resistances to King William's rule.