I also have the Roads of Oklahoma,1997. Please note that Muriel says the main column of Colonel Emory,marching north from Ft Arbuckle,had halted near the McLain County line north of Paoli on May 5,1861. It was from here that Captain Sturgis and Lt.Averell took a squadron of cavalry back along the trail they had just traveled(about 5-7)miles and confronted the Texans a few miles(perhaps 1-3 and somewhere along Hi77 and the RR) north of present Pauls Valley,east(or northeast) of the Washita River.
The Federals were led by the famous scout Black Beaver.The Texans had been closely following Colonel Emorys column for several days.
Mike