Virginia Davis GRAY's 1863-1866 diary published in AHQ, 1983, spring & summer, pg 65, Oct 27, 1863 entry tells of Marmaduke camping last Sat "here" (Princeton) and "... all able to travel to Pine Bluff." He, Cable and Sterling were mentioned Aug 23, 1864 entry in Princeton, left Tuesday for the Missouri/Kansas battles.
Bio of the GRAYS: http://www.rootsweb.com/~arpulask/Col.MrsOCGray.html