Every year, thousands of park guests walk Pickett's Charge and many of them tell similar tales. You are walking along and making your way towards the Union lines. Historically, the Confederate soldiers walked shoulder to shoulder as they marched and at some point during the charge, as soldiers fell and died, the next soldier would have to close ranks and a new soldier would be shoulder to shoulder with you.
Now, people walking the charge on their own, will feel "someone" bump their shoulders and walk with them for awhile before they fall away. During one of our investigations, guests became overwhelmed and began sobbing. Now this could be because of the importance of location, but the guests seemed to think it was more than that. Others have heard the sounds of buzzing past their ears and the moans of the wounded and dying.
If you get a chance to visit Gettysburg, try to take some time and walk this important piece of history.