Christy,
Just when I felt I had looked as far and wide as I could about your Capt Lilley, I thought I'd look a couple of more places in my library at home. I focused on Gen Marmaduke's records from 1862 -late 1864 ( nothing) ; "Frontier Defense in the Civil War " ( nothing) ; "Texas , Dark Corner of the Confederacy" (nothing) and "Fourteen hundred and Ninety One Days in the Confederate Army " by Heartsill ( perhaps something !!) . Heartsill started the WBTS ( Civil War) with the Texas outfit The W.P. Lane Rangers in the 2nd Regiment Texas Mounted Rifles. Later on he served with
other units and he gets captured at Askansas Post and is shipped off to a northern prison, back east, along with the rest of comrades. I won't bore you with the details but as he is and others in his group are trying to work their way back to Texas to rejoin Texas Frontier Mounted Units , they are assigned to Braxton Braggs Army just in time to fight in the terrible battle of Chickamauga . After this , Heartsill and other Texans in his group are looking for a way to "slip off" and get back to Texas. However, before Chickamauga , in his diary , Heartsill makes the following entry on July 5, 1863 when he and others of his unit ( the Rangers) are still in Tennessee.
"........ In the evening I overtake J W Young , E T Bedell and John Beard and we camp for the night on the bank of a nice cool stream near the Tennessee River. Wilson , Warden , Lilley and Husbands , all of the Spy Company ; left today for their command west of the Mississippi River , they left without permission but I hope they may safely reach their Company ; call it desertion if you please ; but I will assert that there are not four better soldiers in the Confederate Army than these men, they are not shirking their service; then is it desertion ? " .

Christy, Heartsill mentions Wilson, Beard and Bedell one more time . He talks about where he thinks each of them went. These three probably stayed in the Tennessee area. He does not mention Lilley again. However, later on he does talk about Beazley's Company joining Morgan's Battalion and all the fuss about whether or not Morgan has a Battalion or a Regiment. He talks about the "Morgan Cavalry Unit" not getting "a numerical designator" until they were organizedand "recognized " by the War Dept. He also spends a GREAT DEAL of time talking about different men of Lanes Rangers trying to get back to their commands in the Trans Miss area. I would highly suggest you purchase this book because there is no doubt in my mind that Heartsill knew your GGGrandfather .
Christy, once again , it looks like Heartsill's comments about "Lilley" support the actions of the well-respected W. H. Beazley when he confirmed the service of your GGGrandfather gour GGGrandmother's pension request.
Best Regards, Craig