If you saw the movie "Gods and Generals", you saw part of the Battle of Fredricksburg. Remember that wall that the Confederates used to shoot at the Union army when they crossed that wide open field? This is a picture of it now, a.k.a. the Sunken Road. (now it's a bit lower) Pretty cool huh? That field the U.S. soldiers crossed is now a bunch of houses and building.
I took this picture myself.