In his book about the Chattanooga Campaign, The Shipwreck of Their Hopes: The Battles for Chattanooga, Peter Cozzens gives an excellent account of the 100th Indiana’s involvement in the assault on Tunnel Hill at the north end of Missionary Ridge along with the other units from Loomis’ Brigade. I had the opportunity to visit Missionary Ridge just after Christmas and found the marker for Loomis’ Brigade that mentions the 100th Indiana. The marker is located in the Pennsylvania Military Reservation. Here is what the marker said:

LOOMIS’ BRIGADE
EWINGS DIVISION – 15th CORPS
COL. JOHN M. LOOMIS
Nov. 25, 1863

26th ILLINOIS LIEUT. COL. R. A. GILLMORE
90TH ILLINOIS COL. TIMOTHY O’MEARA LIEUT. COL. OWEN STUART

12TH INDIANA COL. RUEBEN WILLIAMS
100TH INDIANA LIEUT. COL. ALBERT HEATH

The brigade at 10:30 am took position to the right of Corse’s Brigade and co-operated with it till the termination of its assault. About 1 p.m. with its left of the Tunnel Hill Road north of the Glass House, and supported by Buschbeck’s Brigade, it moved toward the mouth of the tunnel, its skirmishers carrying the position about the Glass House, and part of the main line reaching the railroad. The 27th and 73rd Pennsylvania of Bushbeck’s Brigade then advanced to Loomis’ left and pushed the Confederates back to their works over the tunnel. Matthies’ Brigade next came upon Loomis’ left and charged to the summit of the ridge where it formed on the right and left of the 27th Pennsylvania that had preceded it. Followed by Raum’s Brigade. The entire force was finally repulsed by charges from the crest, and a flank movement from the tunnel. At 4 p.m. the brigade was withdrawn.

If you are interested in a picture of the marker just email me and I’ll sent it to you.