Fort Strong Fort Strong is a location in the Commonwealth in 2287 . Background . The island that Fort Strong sits on was used originally used as a gun battery during the Revolutionary War . The fort itself was established during the Civil War . After being abandoned for almost a century , the fort was then quietly reoccupied in the 2050s by the US military for use as a top - secret weapons research facility , with the interior being renovated and a new basement research level constructed . Live - fire testing of weapons began at the facility in the 2070s . It would eventually be tasked with the devlopment and testing of the Fat Man and T - 51 power armor for use against China . There appeared to be difficulties regarding the development of the Fat Man launching mechanism but ultimately it was perfected just before the start of the Great War . When the base ' s new CO , General Brock , took command of the facility , he leveled the barracks just outside the fort and constructed a mock town instead . This was used as training ground for the developed weapons , hence the destroyed buildings . The island was hastily sealed up and the scientists evacuated in October 2077 , but a sizable weapons and ammo cache of mini nukes were left , most of which survived the Great War , and which the Brotherhood of Steel seeks to obtain to gain a upper hand in its fight against the Institute in 2287 . Layout . From the north end of the bridge leading to fort there is a security checkpoint on the eastern side containing leveled power armor and an ammunition box in the south east corner . After crossing the bridge there is a collapsed building directly ahead , which was previously sealed off by a fence , there is a radioactive barrel inside , but nothing of note . Continuing along the road leads to the main complex where three super mutants can be found patrolling . If the quest Show No Mercy is active , there will also be a super mutant behemoth present . The road forks to the left here , with a cemetery immediately east of the building on the north side of the road . Two teal vase s and a toy car can be found here , whilst wild tato blossoms and wild corn can be found by entrance and in the buildings on either side of the road . The buildings themselves each hold a radioactive barrel , desks and filing cabinets and several junk items can be found scattered around . Behind the eastern - most building is partially collapsed wooden dock with a sandbag wall built upon it . Turning south at the bend leads to another fork in the road , turning east leads one to the pier which has a caps stash behind the wooden crate on the northern corner . The west road loops back to the entrance . Heading directly south leads to the path up to the armory . At the top of the path leading to the armory , turning to the east before the building there are two stairwells . The nearest stairwell leads up the flag pole where three more vases and a wild tato blossom can be found . The stairs furthest away lead up to cannons , where five cannonball s can be found . If one passes the building and goes to the south side of the building there are several more cannons and a another small pile of cannonballs to the side of the central cannon . in the crevice of the northern wall there is another ammunition box . Appearances . Fort Strong only appears in " Fallout 4 " . Behind the scenes . Fort Strong is on the site of real life , off the end of the peninsula ( portrayed as Nordhagen Beach in the game ) . Fort Strong is a real ( former ) military fort , which is located east of Spectacle Island , on Long Island . defended Boston from 1899 until 1947 .