Statistics for occurrence #1 of “Zzz” in page 312 of The Atlanta (Georgia) Campaign: May 1 - September 8, 1864., Part I: General Report.:

...t Brig., Second Div., 4TH Army Corps, Near Atlanta, Ga., September 9, 1864. Captain: I have the honor to report the following statement of casualties for the first six days of September, 1864: Zzz Received during the six days in September of rebel prisoners officers, 1; men, 17. Respectfully, your obedient servant, A. C. McMURTRY, Lieutenant and Provost-Marshal.
...
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.