A few random images from the Gettysburg episode of Battleground (admittedly these are of poor quality but as there's so little out there on Battleground i thought they were worth posting, and they do give a sense of how visually impressive the game was).
Apparently Peter Gilder managed to sell the Gettysburg terrain featured three times - first of all the original commission for the Callan movie, then, after it's return by the film company, to Edward Woodward (the owner when Battleground was filmed), and finally (again, after its return gratis by Woodward) to a wargamer in the USA.