For a truly effective "creeping Barrage" alot has to come into play. Civil War batteries were positioned not layed with survey data, nor was meteorological data calculated into the firing data, nor was there accurate target observation, acquisition, or adjustment. To add to that, a Civil War era gun only has so much Elevation or Quadrant Elevation that can be applied while a modern piece can be elevated near to 90 degrees (1600 Mills); further, Civil War field artillery had VERY limited Traverse, requiring the trail to be shifted, where a modern piece can ofter traverse a full 360 degrees (6400 mils) Also not coming into play was accurate calculation of Firing Data, taking Gun Location, Target Location, Met Data, Elevation of Target above or below gun, application of site, and a myriad of other neat crapola that makes modern artillery so effective.
Artillery didnt truly come into its own untill the Great War. As said before, prior to that, Arty was point and shoot, requiring direct line of sight on the GTL. Also as said earlier, the Hydraulic recouperator made it all possible. Accuracy suffers terribly everytime the gun is displaced. When I was with King Of Battle, on M101A1 split trail 105mm towed guns, we relayed right after the first shots, sincethe guns would have displaced a fraction and set the spades. (a problem we DIDNT have when we transitioned to M119s)
the only effective way that a creeping barrage could have been effective, would have been for the artillery to advance WITH the Infantry, flying out, unlimbering, firing until the infantry caught up, limbering up, and repeat.
13E10,
A Btry, 4th Battalion, 11th Field Artillery Fire Direction Center...