This is pretty neat. Back in October of 2006, I posted about some photos of the Crimean War that had surfaced. So imagine my surprise to see that the entire collection has been posted online - and the original photographer, back in 1855, was a James Robertson. There's an explicit notice on the site about permission being needed before you use the photos, so just follow the link to the King's Own Royal Regiment Museum.
Thanks to Peter Donnelly, the curator at the museum, for letting me know about this!