Here's a short story:

Charles II (29 May 1630 – 6 February 1685) was king of England, Scotland and Ireland. He was king of Scotland from 1649 until his deposition in 1651, and king of England, Scotland and Ireland from the restoration of the monarchy in 1660 until his death. 

Charles II's father, Charles I, was executed at Whitehall on 30 January 1649, at the climax of the English Civil War. Although the Parliament of Scotland proclaimed Charles II king on 5 February 1649, England entered the period known as the English Interregnum or the English Commonwealth, and the country was a "de facto" republic, led by Oliver Cromwell. Cromwell defeated Charles II at the Battle of Worcester on 3 September 1651, and Charles fled to mainland Europe. Cromwell became virtual dictator of England, Scotland and Ireland, and Charles spent the next nine years in exile in France, the Dutch Republic and the Spanish Netherlands. A political crisis that followed the death of Cromwell in 1658 resulted in the restoration of the monarchy, and Charles was invited to return to Britain. On 29 May 1660, his 30th birthday, he was received in London to public acclaim. After 1660, all legal documents were dated as if he had succeeded his father as king in 1649. (End of story)

Provide your best guess for the following question. Give ONLY the guess, no other words or explanation.

For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>

Here are a few examples of questions and answers:

Question: What position did Charles II hold?
Guess: King of England, Scotland and Ireland

Question: What country did he rule over first?
Guess: Scotland

Question: Who was his dad?
Guess: Charles I

Question: What happened to him?
Guess: executed

Question: Where?
Guess: Whitehall

Question: When?
Guess: January 30 1649

Question: Was Charles II ever in a war?
Guess: Yes

Question: Did he lose any battles?
Guess: Yes

Question: Which one?
Guess: Battle of Worcester

Now answer the following question in the same format.

Question: Who beat him?

Oliver Cromwell