In Sterling Price's report to Gov. Jackson
"...Colonel Rives' squadron of cavalry, dismounted, some 234 men, lost 4 killed and 8 wounded. Among the former were Lieutenant-Colonel Austin and Captain Engart. ...."
You are correct that David H Enyard was a native of Daviess County and age 18 when he enrolled in Co E, 3rd MO Inf. His service card is here:
and here:
http://www.sos.mo.gov/TIF2PDFConsumer/DispPDF.aspx?fTiff=/archives/AdjutantGeneral/Civil_War/ServiceCards/s907/1710.tif|/archives/AdjutantGeneral/Civil_War/ServiceCards/s907/1711.tif&Fln=S109781.pdf
There is a David Engart of Howard County Missouri. He married there in 1826 to Esther Curtis. I beleive Howard County was also the origin of Benjamin Rives and most of his command so I'm a bit reluctant to automatically make the David En(y/g)art of Daviess County the same guy.
This David Engart is found as David Engard in the 1830 Howard Co census and then the 1840 Carroll County Census which would be indicative of the Carroll county history having the right name and death place just the wrong unit designator. Obviously the David H Enyard of Daviess Co and Co E, 3rd MO Inf cannot be in the 1840 census in Carroll county as he isn't born yet.
John Russell