When was the coastal defense fortification located east of downtown Portland built?
Fort Sumner (Maine): Fort Sumner was a coastal defense fortification on Munjoy Hill in Portland, Maine, United States. Fort Sumner (Maine):  It was built in 1794 as part of the First System of coastal fortifications built by the United States. Munjoy Hill: Munjoy Hill is a neighborhood and prominent geographical feature of Portland, Maine.
i don't know