The Photographic History of The Civil War: in ten volumes, Thousands of Scenes Photographed 1861-65, with Text by many Special Authorities, Volume 2: Two Years of Grim War.
Francis Trevelyan Miller, Ed.

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[190] object of the Federal armies in the West was to gain control of the entire course of the great Mississippi that it might “roll unvexed to the sea,” to use Lincoln's terse expression, and that the rich States of the Southwest, from which the Confederacy drew large supplies and thousands of men for her armies, might be cut off from the rest of the South. If Vicksburg were captured, Port Hudson must fall. The problem, therefore, was how to get control of Vicksburg.

On the promotion of Halleck to the command of all the armies of the North, with headquarters at Washington, Grant was left in superior command in the West and the great task before him was the capture of the “Gibraltar of the West.” Vicksburg might have been occupied by the Northern armies at any time during the first half of the year 1862, but in June of that year General Bragg sent Van Dorn with a force of fifteen thousand to occupy and fortify the heights. Van Dorn was a man of prodigious energy. In a short time he had hundreds of men at work planting batteries, digging rifle-pits above the water front and in the rear of the town, mounting heavy guns and building bomb-proof magazines in tiers along the hillsides. All through the summer, the work progressed under the direction of Engineer S. H. Lockett, and by the coming of winter the city was a veritable Gibraltar.

From the uncompleted batteries on the Vicksburg bluffs, the citizens and the garrison soldiers viewed the advance division of Farragut's fleet, under Commander Lee, in the river, on May 18, 1862. Fifteen hundred infantry were on board, under command of General Thomas Williams, and with them was a battery of artillery. Williams reconnoitered the works, and finding them too strong for his small force he returned to occupy Baton Rouge. The authorities at Washington now sent Farragut peremptory orders to clear the Mississippi and accordingly about the middle of June, a flotilla of steamers and seventeen mortar schooners, under Commander D. D. Porter, departed from New Orleans and steamed up the river.