Looking for answers

Hello All,
 
My name is Timothy Guinn and I am currently trying to find information on my great-uncle SGT. Isaac L. Isbell. So far in the research that I have collected I know that he was the gunner in the 829th Bombardment Squadron, 485th Bombardment Group, 15th Air Force. My grandmother told me what little she knew of what happened to him 5 years ago when I myself joined the U.S. Air Force. His crew unfortunately paid the ultimate sacrifice on 9/21/1944 and they have a headstone at Jefferson Barracks Memorial Cemetary in St. Louis. I also know that on that day the 829th was flying it's 65th mission in Yogoslavia, which is where my grandmother said they went down, so im assuming this information is correct. This unfortunately is where the information stops flowing, and so I am basically looking for any information on what aircraft they flew, Tail Number, Name of the Aircraft and of course what happened to them on that fatefull day. Below is a list of SGt. Isbell's crew members.
 
Anderson William E 2nd Lt 0-825534 829th Co pilot Sneden, Arthur Clasen Robert C Cpl 37555327 829th Engineer Sneden, Arthur Evans John C Cpl 34794588 829th Gunner Sneden, Arthur Harrison Adolphus H Sgt 14090873 829th Gunner Sneden, Arthur Isbell Isaac L Sgt 34398015 829th Gunner Sneden, Arthur Latham Everett G 2nd Lt 0-723636 829th Navigator Sneden, Arthur Scherr Howard M Pvt 6282209 829th Gunner Sneden, Arthur Schneck Raymond E Cpl 15080866 829th Radio Opr Sneden, Arthur Sneden Arthur P 2nd Lt 0-822560 829th Pilot Sneden, Arthur Weiss  August L 2nd Lt 0-703543 829th Bombardier Sneden, Arthur
 
If any of the above men were relative of yours or if you have relatives associated with the 829th, I would greatly appreciate in information you may be able to give me. I would also love to have some old photos and stories, if possible,  of my great-uncle as I am doing this, not only since SGT. Isbell is my great uncle and I have a kinship as a fellow Airman, but also to provide information to SGT. Isbell's son, Gary, who was only a few months old when his father died.
 
I would greatly appreciate any information any of you can provide.
 
Sincerely,
 
Timothy Guinn