From the replies it seems like you got your info. Just wanted to share with your gggrandad served with my ggrandad in the 61 Co B mine was Capt DRA Johnson. There ia a book called A Soldiers Story Of His Regiment by G.W. Nichols who also served in the 61st.You can sometimes find a copy on abebooks .com or even on e-bay. I have a reprint of it that I ordered from higginson book company they do have a web site. Hope this may also help. Thanks