Fort McIntosh (Pennsylvania)

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Fort McIntosh was a Revolutionary War era Patriot log frontier fort situated at the confluence of the Ohio River and the Beaver River in what is now Beaver, Pennsylvania.

The fortress was constructed in 1778 under the direction of Lt. Col. Cambray-Digny and named in honor of General Lachlan McIntosh. It was occupied until it was abandoned in 1791.

After the Revolution, the fort was the home of the First American Regiment, the oldest active unit in the United States Army.

The fortress was the site of the signing of the Treaty of Fort McIntosh on January 21, 1785.