Does anyone have a good description of the roll that Woodruff's Battery, the Weaver Light Artillery, aka Marshall's Battery played at Cotten Plant? Woodruff indicates tha they were present but doesn't seem to indicate that they were actually engaged?

http://babel.hathitrust.org/cgi/pt?q1=Cotton%20Plant;id=wu.89059402198;view=1up;seq=83;start=1;size=10;page=search;num=75#view=1up;seq=83