Respuesta :
The Union struggled to take Vicksburg from the Confederacy because the fort was located on top of a hill and surrounded by swamps. The correct option among all the options that are given in the question is the first option or option "A". I hope that this is the answer that has come to your desired help.
Answer;
The fort was located on top of a hill and surrounded by swamps
Explanation;
-The Battle of Vicksburg, Mississippi, also called the Siege of Vicksburg, was the culmination of a long land and naval campaign by Union forces to capture a key strategic position during the American Civil War.
-President Abraham Lincoln recognized the significance of the town situated on a 200-foot bluff above the Mississippi River.