The Official Records, Volume 34, Part 1, has two maps of the Battle of Mansura on pages 234-235. The maps are kind of confusing as they show First Position, Second Position, and Position No. 3. Some people read this as the battle occurring in 3 phases, which was not the case. It was a fluid, dynamic battle, and these maps are meant to show early in the battle, midway through the battle, and late in the battle. Read them like that and you'll be OK. There are other maps of the battle, by a New York cartographer whose name I can't recall right off, but the OR maps are the most frequently utilized.