This is something of a curiosity. For a film so obsessed with its locations and its accuracy, one of the most significant theaters of combat in the entire film is completely made up. There is no Ramelle. There has never been a town in France called Ramelle, and no Battle of Ramelle ever happened.
This is at odds with everything else we see in the film. The Normandy Landings certainly happened, and every other geographic location which is either seen or name-checked on screen during 'Saving Private Ryan', so this is the only thing that's been made up. Nobody seems to know what prompted the decision to go with a fictional location. Perhaps because there was no real Private Ryan, Spielberg thought it would be disrespectful to the real battles of World War II to show fictional events happening during one of them?