Karen Ferguson Roach,
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Your two Fergusons are mentioned in my book. Below is from my 200-page Name Index. If, and when you learn, this "Rachel A. Ferguson's" and "Martha M. Ferguson's" maiden names, please let me know so I can include them.
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FERGUSON, William Ferguson (1828 TN-Aug 15, 1862) m-Rachel A.; Robert's 11th Inf, Co D (Titus Co, TST), 86
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FERGUSON, Witt D. Ferguson, b-1830 TN; m-Martha M.; Robert's 11th Inf, Co D (Titus Co, TST), 81
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Patti, prochette@Juno.com .