Visible crew/equipment: When the 20th Maine Regiment is getting ready to charge down the hill, on the left you can see a man in a light blue shirt sitting with a camera pointed at the soldiers. (02:14:40)
Visible crew/equipment: In the scene near the beginning of the film, when the 2 brothers are fixing to leave to join the army. After the mother gives them the flag, the shot changes to the 2 brothers. You can see the boom mic and the camera in the reflection of their shiny brass buckles.
Answer: The nearest one I can find listed was at Kirksville in northern Missouri.