Dade County came under effective Federal control in September 1863.
Chattooga County came under intermittent Federal control in September 1863. Effective control probably was not fully established until about March 1864 Prior to this Federal Cavalry Patrols moved in and out of the county.
Please let me know if you have any questions.
Gerald D. Hodge, Jr.
War Between the States Historian
Historian: 39th Georgia Volunteer Infantry Regiment