I ran across this Doc Rayburn reference in the monthly returns of the 8th Missouri Cavalry US.
"On Dec.31st Lt. Robinson, C co, was ordered out with 6 men & 1 wagon to procure lumber for building purposes, were attacked by the notoriopus rebel guerrilla Rayburn with 15 men & ordered to surrender. Lt. Robinson peremptorily refused & jerked out his revolver but was immediately shot in the shoulder & thigh. He & his party ran into a waste house & kept up a brisk fire. The rebels fell back with the loss of 2 killed. The rebels captured 3 mules. A messenger reported the affair immediately & half the regiment were in the saddle in 5 minutes. They chased the rebels 17 miles, who escaped only by dispersing. The 3 mules & several horses were captured."
Rayburn must have given them fits around Brownsville-DeValls Bluff that winter.