http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GSvcid=256396&GRid=34387136&
Sam stated in the book Trail Drivers of Texas that he was born in 1847.
http://www.lib.utexas.edu/books/texasclassics/traildrivers/txu-oclc-12198638-c-0519.html
My own ancestor Elihu L. Kirksey served in Cocke's Co., Benavides' Regiment, yet his grave marker states that he was in the 17th Texas Infantry, Co. K. Wrong! His uncle Ervin L. Kirksey was in this unit, died at Milliken's Bend, and was buried on the battlefield. Somebody just found an E.L. Kirksey and assumed it was the same one, and put an incorrect grave marker!
http://www.findagrave.com/cgi-bin/fg.cgi?page=gr&GRid=9909340