Found this in Stanley F. Horn's "The Army of Tennessee," U. of Oaklahoma Press, 1993, p. 270.

"Buckner says:

'We encountered in our advance the right wing of our army, which . . . was moving in a direction perpendicular to our line of march . . . . The battery was about to fire on a body of men, rapidly moving westward across the road. But I directed Williams to withold his fire, saying: 'Those men are beaten, they are cheering'; and galloping forward I found them to be the 'Orphan Brigade' of Kentucky Confederates. It was here that I soon afterwards met General D. H. Hill . . . . The continued cheers of the army announced at dark that every point of the field had been gained.'"

In Longstreet's memoir "From Manassas to Appomattox," Indiana University Press, Bloomington, 1960, pp. 453/4, he notes:

"We were pushed back through the valley and up the slope, until General Preston succeeded in getting his brigade under Trigg to the support. Our battery got up at last under Major Williams and opened its destructive fire from eleven guns, which presently convinced General Thomas that his position was no longer tenable."

It should be noted that the book's index records a Col. Samuel C. Williams to be found on page 453 where we only find the Major Williams noted above.