Yes there's a map that shows two hospitals at DuValls Bluff. I got the map from the National Archives many years ago. its a rather large map. One hospital was a Union and the other was for Confederates or prisoners, If I remember correctly. They were about a quarter of a mile apart. I would have to check the map again, the confederate one was between Fort B and Fort Geiger. The Union hospital was north of Fort Geiger and a little northwest of Fort D.