How did French loan words influence English after the Norman invasion in 1066?

The major influence of French words in the time right
after the Norman conquest was that French became the prestige language of England.  When
one language becomes a prestige language, many of its words (especially in areas of
culture and power) enter into the native language of the
country.

This is how French impacted the English language. 
French words entered the English language in areas of power (government, military) and
in areas of culture (food, entertainment).  These words like baron, dame, lieutenant,
enemy, pork and beef came to be used by people who wanted to get themselves into power
or who wanted to act like they were high class.  Eventually, they filtered down to the
rest of the people.