A four-year occupation was started in 1814 which saw Eastport and a large portion of eastern Maine either occupied by or under threat of occupation by the British. During that time Eastport became part of New Brunswick, Canada, and the British Empire. On that July day the Stars and Stripes was lowered from the flagpole at Fort Sullivan to be replaced by the Union Jack. Even after word of peace reached England in February, 1815, British forces remained in Eastport, which they insisted had always been a part of New Brunswick. This territory was returned to the United States by the Treaty of Ghent. The U.S. Senate unanimously approved the treaty on February 16, 1815, and President James Madison exchanged ratification papers with a British diplomat in Washington on February 17; the treaty was proclaimed on February 18 and fighting immediately stopped when news of the treaty finally reached the United States.
Fort Sullivan and the Powder Magazine sites contain archeological remains and, as it was for the small band of American defenders, offer amazing views of the passage taken by the invading armada.