No one needs to be reminded that the War for the Union was the greatest struggle of modern times. The task of bringing back to their allegiance those who had risen against the authority of the National Government was a gigantic one, and taxed the courage and resources of the country to the utmost. In order to make the war effective, it was necessary to enforce a rigorous blockade over three thousand miles of seacoast, open the Mississippi river, and overcome the large and well-officered armies in the field. The last was committed to the land forces, and it proved an exhausting and wearying struggle.
Among the most important steps was the second—that of opening the Mississippi, which being accomplished, the Southwest, from which the Confederacy drew its immense supplies of cattle, would be cut off and a serious blow struck against the armed rebellion.
The river was sealed from Vicksburg to the Gulf of Mexico. At the former place extensive batteries had been erected and were defended by an army, while the river below bristled with batteries and guns in charge of brave men and skillful officers.

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