Gay, checked the CWS&S site and your grt-grt-grdfather was in the same company(I)that my grt-grt-grdfather was in . I check through some books I have that mention Arkansas Post and during the month of Dec. there were many cases of pneumonia and men were dieing faster than they could bury them . But,unfortunately,there are no records showing where these graves were. Your grt-grt-grdfather was in 25th Texas Cavalry(a.k.a. 3rd Texas Lancer's or Carter's Lancers). Most of orginally formed in Liberty,Tx.(Liberty Co.).They were under the command of Colonel C.C. Gillespie and Company I was commanded by Cap. E.B. Pickett. In mid/late 1862 at Hempstead,Tx.,they were formed into 25th Texas Cavalry Co.I and sent to Sheveport,La. and became part of Granbury's Texas Brigade . They were sent ,along with the 24th Texas Cavalry(2nd Texas Lancer's)and 6th Texas Infantry to build Fort Hindman at Arkansas Post. The winter of 1862/63 was very harsh and the men did not have clothing for this kind of weather and many became ill and died. My grt-grt-grdfather also died of pneumonia but not til he was captured Jan.11,1863 at Arkansas Post. The best book I can recomend on the 25th is Book by Anne J. Bailey."Between the Enemy and Texas:Parsons's Texas Cavalry in the Civil War.