Fort madison, Madison Island ? In the Bay ?

[jeff of pa]

as Per Google Search : It is possible that "Madison's Island" might have been a historical name for an island in the Massachusetts Bay, but based on the provided search results, there is no mention of such an island.
Important Part of a Longer Article From

The United States Gazette​

Sat, Jul 16, 1814 ·Page 4

in SEPIA