I am doing some research on the Battle of Gilgal Church and Marietta National Cemetery.

"On the 19th [May], the Regiment made another charge at Cassville, losing 1 killed, 4 wounded. They were engaged again at New Hope Church on the 25th. [May], losing an additional 5 killed, 47 wounded. On the 10th. [this was actually 15th and 16th] of June they were engaged yet another time at Golgotha [Gilgal] Church, losing 4 killed, 9 wounded." - Record of service of Michigan volunteers in the Civil War, 1861-1865, Vol. 19, page 26.

I have found the following:
Frederick Clay, Sgt, Co I, d. June 15, buried G-8253
Col Griffin, wounded June 15, d. June 16. Where buried?
Charles F. Crippen, some evidence that he is buried in H-8747, marked as Unknown Soldier.

Of the 4 killed, is Col. Griffin included in that count and where is he buried? Who were the four killed?

I have posted my information on Findagrave for Frederick Clay and Charles Crippen. See:

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSvcid=9760&GRid=19552558&

http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSvcid=9760&GRid=14449316&