During the month of August, 1863, the 55th Ohio, along with its brigade, was encamped near Catlett's Station, Virginia. Though inactive, the regiment performed its share of "very heavy" picket duty. Not much else is recorded for this time.
Sources:
Trials and Triumphs: A Record of the Fifty-Fifth Ohio Volunteer Infantry by Hartwell Osborne, 1904, A.C. Clurg & Co., Chicago.
All Brave And True by Dan Munson, 1987.