Col. Wirt Adams reported to Gregg during the night of the 12. However, Gregg believed he had sufficient mounted troops. Therefore, the next morning Adams moved to Bolton to protect the Souther Railroad. See: The Campaign for Vickburg, Vol. II, Grant Strikes a Fatal Blow, Edwin Cole Bearss, Morningside, 1986, pp. 524/5.

BOLTON DEPOT, May 13, 1863.
Lieutenant-General PEMBERTON:
After checking a column of the enemy yesterday, for 4 miles at Dillon's, I marched by General Gregg's order to Raymond, and fell in his rear. In withdrawing, marched from Mississippi Springs this morning at 3 a.m., and am now equidistant from Raymond to Clinton and Bolton, to protect the railroad. Colonel Thompson's command remains with General Gregg. The enemy encamped 1 mile east of Raymond. No movement yet reported.
WIRT ADAMS,
Colonel, Commanding Cavalry. [OR, Ser. 1, XXIV, pt. III, p. 871]

George Martin