Scouting in Murray County, Georgia: near Waterhouse's Farm and Sumac Creek, March 1864

Official Records, Series 1, Vol. 32, Part 3 (Correspondence, etc.), 101.
https://texashistory.unt.edu/ark:/67531/metapth152650/m1/110/

A.P. Campbell, 21 Mar. 1864, Cleveland, Tenn., to Brig.-Gen. William D. Whipple

"One of my scouts left Sumac Creek south of Waterhouse's farm at 12 o'clock last night, and reports having heard drums in a southwest direction from there in the evening."

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Citation:

United States. War Department. The War of the Rebellion: A Compilation of the Official Records of the Union And Confederate Armies. Series 1, Volume 32, In Three Parts. Part 3, Correspondence, etc., book, 1891; Washington D.C.. (texashistory.unt.edu/ark:/67531/metapth152650/m1/110/?q=Sumac%20creek%20south%20of%20Waterhouse%27s%20farm: accessed August 26, 2017), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting UNT Libraries Government Documents Department.

The following site has a text extract. The site references the Serial Set instead of the O.R. books, which makes it hard to find elsewhere; but it is searchable over a series of the official records.
https://ehistory.osu.edu/books/official-records/059/0101