After somewhat reading the attachment it appears to me that the Perkin's plantation cited in not at Milliken's Bend but much far south. While still on the western bank Louisiana side of the Mississippi River it seems located at that point where Grant's Army came across the Mississippi River into the State of Mississippi after a black slave convinced him the road were very good in that area. The reason I proposed it may be a Freedmen Hospital is that the Negro Brigade being formed there is composed of all Freedmen which leads one to assume a hospital was started there for their services.