He joined the Navy from Boston in March 1864 , and served during the Civil War as a boatswain 's mate on the USS Brooklyn .
Dennis was born in 1826 in Charlestown , Massachusetts .
Dennis joined the Navy from Boston in March 1864 , and served during the Civil War as a boatswain 's mate on the USS Brooklyn .
Dennis was born in 1826 in Charlestown , Massachusetts .