I'd say that's a real good documentary of Shiloh. I've never seen it, and now want a copy. The story of Cockerill is intriguing and I've never heard it and is dang near a tear jerker, though the post-script mentioning he became a journalist makes me wonder if more study is needed before taking it for gospel.
There's some things wrong, (I'm sure the Welsh Henry Morton Stanley would be very interested to hear he's Irish in this film, brings back memories of when he was required study for me in High School), and some reenactors have impressions not very well researched, with other exceptionally good, but at the end of the day I'd say this is one of the better Shiloh documentaries I've ever seen.