some (late) info on this one- already figured out by Salty, and also in Alan's summary page.
I underlined some of the clues: The balloons flown included both the the Intrepid and the Constitution, flown at the Battles of Gaines Mill and/or Fair Oaks, part of the more familiarly known First Battle of Cold Harbor by those in union suits. All of this part of the Peninsula Campaign east of Richmond, Va during the War between the States.