Statistics for occurrence #1 of “Zzz” in page 511 of The Atlanta (Georgia) Campaign: May 1 - September 8, 1864., Part I: General Report.:

... whom have been forwarded. Nothing new to-day, August 15, 1864. R. W. Johnson, Brigadier-General, Commanding. headquarters 14TH Army Corps, Before Atlanta, Ga., August 15, 1864. Zzz R. W. Johnson, Brigadier-General, Commanding. headquarters Fourteenth Army Corps, Near Atlanta, Ga., August 20, 1864.
...
Max. Freq. Min. Freq.
Entity Corpus Doc Corpus Doc  
† ZZZ 3,532 210 0 0 0 user votes
Interrogavi Terramn Zzz 4 0 0 0 0 user votes
March Zzz 2 0 0 0 0 user votes
S. ZZZ 2 0 0 0 0 user votes

† This entity has been selected by the automated classifier as the most likely match in this context. It may or may not be the correct match.