[Polybius]

....by showing his fictitious relationship with a little girl.....

Why do you characterize that as "fictitious"?

Jackson's relationship with Janie Corbin during the winter of 1862-63 is well known to Jackson historians.

During the winter of 1862-1863, Confederate General Thomas "Stonewall" Jackson set up his winter headquarters at Moss Neck Manor plantation. Janie Corbin, daughter of Richard and Roberta Corbin, owners of Moss Neck plantation, frequently loved to call on the General in the outbuilding he used as his office. The General grew very fond of his "little Janie." Cutting out a string of paper dolls, she would hold them aloft and call for the inspection of "my Stonewall Brigade." On the day he left camp, General Jackson stopped to give thanks for the Corbin's hospitality. Mrs. Corbin told him that Janie had fallen ill with scarlet fever, but that she was doing better and a full recovery was expected. The following day, March 17th, General Jackson was told of Janie's death. Thomas Jonathan Jackson, Stonewall of the Confederacy, sobbed uncontrollably upon hearing of the death of his "little Janie."

[ravinson]

Jackson's relationship with Janie Corbin during the winter of 1862-63 is well known to Jackson historians...

I've never seen it mentioned in any Jackson biographies, but even if it is a true story, the movie's telling of the tale was rather hokey and certainly lacked context (eg. far more Civil War soldiers being killed by disease than in battle).