While ever on the alert for references or connections to Crockett's Bluff on the Internet -- thanks to Google -- I recently came across the following historical note published in the midst of the Civil War in "The Military Situation" section of the April 30, 1864 edition of Harper's Weekly:
"Captain Phelps, of the gun-boat No. 26, captured a rebel mail-carrier near Crockett's Bluff, Arkansas on the 4th, with five hundred letters from Richmond and other points, and sixty thousand percussion caps for General Price's army. The letters contained critical communications for Shreveport, and a considerable sum of Federal money."