...instructed Grover to keep it up. My left wing must now be at Sister's Ferry, crossing the Savannah River to the east bank. Slocum has orders to be at Robertsville to-morrow, prepared to move on Barnwell . Howard is here, all ready to start for the Augusta Railroad at Midway. We find the enemy on the east side of the Salkiehatchie, and cavalry in our front; but all give ground on our approach, a...