Johnston withdraws his army across Mill Creek…

Johnston withdraws his army across Mill Creek during the night of March 21 until the following dawn, and burns the bridge behind him, leaving behind a cavalry detachment as a rearguard.

The Union army fails to detect the Confederate retreat until it is over.

Union forces pursues at first light, driving back Wheeler's rearguard and saving the bridge.

Federal pursuit is halted at Hannah's Creek after a severe skirmish.