While the characters and storylines are fictional, "A League of Their Own" is based on the true story behind the formation of the All-American Girls Professional Baseball League during World War II. The league was formed to provide sports entertainment on the home-front while many male baseball players went to war. As was the case in the 1992 "A League of Their Own" movie, the new series' Rockford Peaches are based on the real team of the same name. While the characters in "A League of Their Own" are entirely fictional, some storylines are adapted from the real experiences of the historic players on and off the field.