Why would an army want control of a city like Savannah during wartime?

A. Savannah is a railroad hub
B. Savannah is an important port city, so controlling Savannah would allow an army to control the supplies going in and coming out of Georgia
C. Savannah is Georgia's prettiest city and is considered highly desirable.
D. Savannah is the cotton capital of the South

B. Savannah is an important port city, so controlling Savannah would allow an army to control the supplies going in and coming out of Georgia.