Good analysis, but I would counter that the destruction of III Corps was too high a price to pay. This included what was considered the best division in the army, Kearny's former command. Sickle's advance made possible the near collapse of the Union center and loss of the field of battle. Chris
Or Sickles could simply have occupied the position on Cemetary Ridge , Devils Den and Little Round Top as he had been ordered to do. No need to destroy III Corps just to delay a Confederate attack when LTR could havebeen a formidable position with artillery.
Terry
For the sake of discussion, I will contend that even if Sickles had maintained his original positions, in accordance with his superiors’ directives, there is no guarantee that III Corps still wouldn’t have been wiped out.
The men of III Corps were under the command of Dan Sickles and would still have been subject to their commander’s tactical skill and C3I (command, control, communications & intelligence) abilities.
Also, they still would have been facing the same rebel units and commanders that ended up ejecting them from the Peach Orchard, Devil’s Den and the Wheat Field. IMHO it is reasonable to assume that Hood and McLaws could have enjoyed similar success against Sickles on LTR and Cemetery Ridge.
Given these unfortunate circumstances there is also no guarantee that the Union army would have been able to resist the assault launched by Longstreet’s Corps had Sickles and III Corps occupied the positions that Meade and his staff originally ordered.
The focal point of my argument on this particular subject is combat power.
Combat Power: Definition: (DOD, NATO)
The total means of destructive and/or disruptive force which a Military unit/formation can apply against the opponent at a given time.
Based on the fighting that occurred on July 2, 1863, we know that it took the III Corps and elements from two other Union Corps to eventually halt the Confederate attacks against the Union left. Additionally, the Confederates were denied the attainment of their primary objectives by the narrowest of margins. The eventual outcome of the second days fighting came down to a few pivotal decisions and actions executed by junior officers at decisive moments.
The key here is whether or not we believe that the difference in terrain and position gained by occupying Cemetery Ridge and LTR would have enabled the III Corps to sustain an effective defense against the potential combat power that the Confederates of Longstreet’s Corps were capable of projecting in their assault against the Union left. And if not, then could the other senior level Union commanders (i.e. Meade, Hancock, Sykes etc…) have reacted to the developments in such a manner that would have allowed the Army of the Potomac to either properly support III Corps and repel the rebel attack or to expel the Confederates from their captured positions (Cemetery Ridge and LTR) with a timely and coordinated counter-attack.
When we look at what actually occurred, we know that Sickles’ maneuver immediately focused the attention of his peers and superiors on the decisive point of the fighting on the Second Day. His Corps successfully drained enough of the Confederate’s combat power before the rebels could reach Cemetery Ridge and LTR. This allowed the Federal Army’s reinforcing units that eventually occupied these positions to effectively hold against what little combat power the Confederates had left to throw at them.
Also, by forcing the Confederates to fight well in advance of the key terrain features that dominated this portion of the battlefield, Sickles and III Corps bought valuable time for the Union command team to appropriately react to the situation. The end result of the fighting on the Union left flank was that all of the forces involved (US & CS) took a severe pounding and that the Union Army still retained control over the key terrain features.
So, the question remains, “Could the Union Army still have held Little Round Top and Cemetery Ridge if Sickles would have obeyed his orders and stayed put?”