With the Mississippi in their possession to the mouth of the Ohio, the presence of the English and French fleets at New Orleans would have brought about that result.
The Army of the Potomac, after having been put upon a scale of the rarest magnificence consistent with mobility, and with several changes of commanders, took three years and a half to reach Richmond, and was not then half way to a decisive point, and never would have been strong enough had the expedition to open the Mississippi been executed on the plan as originally devised.
Strategically an invasion always leads to deep lines of operations which, on account of the difficulty of maintaining communications with its base, are always dangerous in a hostile country, and every mile the national armies advanced, every victory they gained, carried them farther from their base, and required an increase of force to protect their communications; while every retreat of the enemy brought him nearer to his resources, and it is mathematically certain that he would soon have reached the point on that line where he would have been the superior power. Nothing but the results of the Tennessee campaign prevented Lee from recruiting his army and extorted from him his sword at Appomatox Court-House.
The Mississippi expedition was designed by the aid of the one from the Gulf to clear the river to the mouth, etc. Could it succeed? Could it open the Mississippi to its mouth? These momentous questions and the military delay were weakening the confidence of the people and confirming foreign powers in the belief that the Government had neither the strength nor the ability to conquer the rebellion. And even could the expedition have opened the river, was there any point on that river where a decisive blow could have been dealt the Confederacy? The Memphis and Charleston railroad, the only complete interior line of communication, would not necessarily have been touched. So long as the Confederacy could maintain its interior lines of communication complete, the United States could neither destroy its armies in the east nor open the Mississippi river. The National Government could only escape annihilation by reaching the center of the Confederate power and striking a fatal blow upon its resources. Geographically, there was but one mode of attack by which this could be accomplished, and this was unthought of or unknown to all connected with the prosecution of the war.
Mr. Lincoln saw from the beginning the vital importance of regaining the Mississippi and controlling the resources of its great valley, and therefore reserved to himself the direction of this expedition as Commander-in-chief. He was fully alive to the perils that now environed the Government, and he and his advisers looked imploringly to the army for relief as the agency absolutely essential to the nation's life. This and this only could strike the blow that must then be struck, if ever.
No display of military genius could have extorted from Lee his sword so long as his resources were unwasted. No valor on the part of our navies and armies could have opened the Mississippi so long as the Confederates could keep open the lines of communication. The Memphis and Charleston railroad was their only complete bond of connection between their armies of the east and the armies of the Mississippi Valley. There was but one avenue by which this bond could be reached and effectually severed, and that was the Tennessee river. The people had responded grandly; their uprising in behalf of their endangered Government had astonished the world. It now remained for the army to supplement by its valor in the field what the Administration and the people had done at home.
Never was the stress and strain of a nation more severe; never when another defeat would have been so perilous and a victory so desirable as then. So long as the Confederates were undisturbed in the possession of the southwest, and men and munitions of war sent uninterruptedly to the east, the Army of the Potomac could not advance. Something had to be done to cripple or engage the rebel armies in that section.
As the weary months of October and November wore away, the darkness grew more and more intense and the anxiety more oppressive. A blow had to be inflicted quickly that would be sharp and mortal, to ward off intervention and invasion by European powers, to smother the spirit of secession in southern Illinois and Indiana, and to prevent financial bankruptcy, which of itself must destroy the nation.
And yet neither Mr. Lincoln nor his generals knew or had in mind any plan other than that of forcing a passage down the Mississippi, bristling with batteries that frowned from its bluffs, while swamps and bayous skirted and pierced its banks, affording defenses in the rear little less formidable and forbidding.
And thus the nation stood as in the hush that precedes the storm or the crash of battle, apprehending not so much any particular movement of the Confederate armies as the threatening elements generally with which the air seemed surcharged, and knowing not how or when or where the blow would fall. Military success was of all things most desired; military delay of all things most dreaded. With the South to stand still was their strength; time was power, and every day's delay increased the thickening dangers that were closing around the Union cause. With the North not to advance was to recede; not to destroy was to be destroyed. The exigencies of the situation made it imperative that the decisive blow should be struck thus early in the war. How to make that advance and deliver that fatal blow was the great problem to be solved. Omniscience only was then able to know whether the last sun had set to rise no more on the Union of these States. The country was clamorous for military successes, but not half so troubled as was Mr. Lincoln and his advisers, for the people did not know, as they did, how much depended thereon; how the beam trembled in the balance and what irremediable evils were involved in delay.