It is important to pull out the KEYWORDS of your topic to search the Library databases. Think about all of the different terms you can use for a subject (medieval, middle ages, etc.). Remember you can perform exact phrase searches by using quotes around your phrases. You can also narrow down results by doing a SUBJECT or TITLE search.
What were the causes of the French Revolution?
To what extent did Napoleon promote Enlightenment Ideas?
Napoleon AND Englightenment
What impact did World War 2 have on civilians?
World War 2 (World Ward, 1939-1945) AND
Why did France win the Hundred Years War?
France AND Hundred Years War
What role(s) did medieval peasants play within the feudal system?
medieval peasants AND feudal system
Here is an example of how you might enter search terms in the EBSCO search interface.