The truth is that the northern column with which, following their orders, Butler and Farragut were now trying to co-operate had ceased to exist; Jackson meant Beauregard's rear; and, as for any co-operation between Halleck and Williams, Beauregard stood solidly between them. On the 17th of April, the day before Porter's mortars first opened upon Forts Jackson and St. Philip, the whole land force of this northern column, under Pope, at that moment preparing for the attack on Fort Pillow, had been withdrawn by imperative orders from Halleck, and, on the very evening before the attack on Fort Pillow was to have been made, had gone to swell the great army assembled under Halleck at Corinth; but as yet neither Butler nor Farragut knew anything of all this. Save by the tedious roundabout of Washington, New York, the Atlantic, and the Gulf, there was at this time no regular or trustworthy means of communication between the forces descending the Mississippi and those that had just achieved the conquest of New Orleans and were now ascending the river to co-operate with the northern column. Thus it was that a single word, daubed in a rude scrawl upon the walls of the custom-house, meeting the eyes of Paine's men after they had made a way into the building with their axes, gave to Butler the first intelligence of the desperate battle of the 6th and 7th of April, on which the fate of the whole Union campaign in the West had been staked, if not imperilled, and which in its result was destined to change materially the whole course of operations in the Gulf Department. That word was Shiloh.
By the 26th of May the _Oneida_ had been joined by the rest of the fleet, under the personal command of the restless and energetic flag-officer. On the afternoon of this day the fleet opened fire. The Confederates replied sparingly, as much to economize their ammunition and to keep the men fresh, as to avoid giving the Union commanders information regarding the range and effect of their fire.
The river was now falling. The _Hartford_ in coming up had already grounded hard, and so remained helpless for fifty hours, and had only been got off by incredible exertions. Provisions of all kinds were running very low. On the 25th of May, after a thorough reconnoissance, Farragut and Williams decided to give up the attempt on Vicksburg as evidently impracticable. Farragut left Palmer with the _Iroquois_ and six gunboats to blockade the river and to amuse the garrison at Vicksburg by an occasional bombardment in order to prevent Smith from sending reinforcements to Corinth.