It was in operation during several American conflicts , including the United States Civil War , World War I , and World War II .
On South Portland 's waterfront is Fort Preble , which is a military fort established in 1808 to protect Portland Harbor .
South Portland was in operation during several American conflicts , including the United States Civil War , World War I , and World War II .
On South Portland 's waterfront is Fort Preble , which is a military fort established in 1808 to protect Portland Harbor .