This is from the magazine’s September, 1902 edition. Late news even then, and I have no idea why they ran it, but it tells where our Lt. Col. O’Brien was nine months after the Battle of Fort Sanders—a Confederate POW.

“CAMP CHASE, OHIO, August 21, 1864.
There is no general officer here. The most distinguished officers with us are Colonel O’Brien, of the Thirteenth Mississippi Regiment, who was captured on the parapet of Fort Sanders, Knoxville, after Longstreet’s memorable charge, Colonel Josey, of Arkansas, who is still suffering from his wounds, Majors Calmees and Green, of Virginia, one of the cavalry and one of the engineer corps, and Col. William Stewart Hawkins, of the noted scouts of Middle Tennessee.”