During the month of August, 1864, General Sherman's Union army continued siege operations against the city of Atlanta, Georgia. Hartwell Osborne of the 55th Ohio described some of the scenes: "About August 10 a battery of four and one-half inch Parrott guns was established near the left of the brigade which fired into Atlanta along the line of Marietta Street. This battery fired a shot every five minutes with a regularity which became monotonous. The elevations near at hand were also armed with guns of various calibre, and these joined daily in bombarding the town. The ceaseless picket firing, skirmishing, and daily combats, large and small, rendered the service upon this part of the line the most trying yet experienced."
On August 25th, 1864, as part of a maneuver by General Sherman to threaten the Atlanta defenses by attacking the rail line at Jonesboro, the 20th Corps (including the 55th Ohio) fell back from the Atlanta siege lines to cover the crossing over the Chattahoochie River. Wood's brigade was part of the force covering Turner's Ferry. On August 27th in skirmishing with confederate forces that were probing the Union positions around Turner's Ferry, the 55th Ohio lost at least three men (1 killed, 1 wounded, 1 captured) and possibly more.
Sources Trials and Triumphs by Hartwell Osborne, 1904
All Brave and True by Dan Munson, 1986