Reddit reviews The Civil War Day by Day: An Almanac, 1861-1865

I'd definitely recommend this book on the 11th Virginia Cavalry which is part of the Virginia Regimental Histories series. My 2nd-great grandfather was in the 3rd Virginia Cavalry and the book on that by Thomas P. Nanzig as part of the series gave an incredible amount of detail and was everything I was looking for. I can pretty much say now exactly where the regiment was and what they were doing on every day of the war. The series is expensive because I think they only printed in 1,000 copies each (the one I have is marked 760 of 1,000 and signed by the author) but I don't think you'll be disappointed. It will be an heirloom.

Another way to find out more about how he was captured is if you know the exact date then look it up in a book like The Civil War Day by Day: An Almanac, 1861-1865 and if you know the general location it should be pretty easy to tell. I had to do this for another of my 2nd-great grandfathers who was in the Alabama cavalry which isn't as well documented as the Virginia cavalry so there is no in-depth regimental history devoted to it, but I knew about where he was and the date so I was able to figure it out.