The opening of the Mississippi and the capture of New Orleans formed important parts of the first comprehensive plan of campaign, conceived and proposed by Lieutenant-General Scott soon after the outbreak of the war. When McClellan was called to Washington to command the Army of the Potomac, one of his earliest communications to the President set forth in general terms his plans for the suppression of the Rebellion. Of these plans, also, the capture of New Orleans formed an integral and important part. Both Scott and McClellan contemplated a movement down the river by a strong column. However nothing had been done by either toward carrying out this project, when, in September, 1861, the Navy Department took up the idea of an attack on New Orleans from the sea. At the time of the secession of Louisiana, New Orleans was not only the first city in wealth, population, and importance in the seceded States, but the sixth in all the Union. With a population of nearly 170,000 souls, she carried on an export trade larger than that of any other port in the country, and enjoyed a commerce in magnitude and profit second only to that of New York. The year just ended had witnessed the production of the largest crop of cotton ever grown in America, fully two fifths of which passed through the presses and paid toll to the factors of New Orleans. The receipts of cotton at this port for the year 1860-1861 were but little less than 2,000,000 bales, valued at nearly $100,000,000. Of sugar, mainly the production of the State of Louisiana, the receipts considerably exceeded 250,000 tons, valued at more than $25,000,000; the total receipts of products of all kinds amounted to nearly $200,000,000. The exports were valued at nearly $110,000,000; the imports at nearly $23,000,000. It is doubtful if any other crop in any part of the world then paid profits at once so large and so uniform to all persons interested as the cotton and sugar of Louisiana. If cotton were not exactly king, as it was in those days the fashion to assert, there could be no doubt that cotton was a banker, and a generous banker for New Orleans. The factors of Carondelet Street grew rich upon the great profits that the planters of the "coast," as the shores of the river are called, paid them, almost without feeling it, while the planters came, nearly every winter, to New Orleans to pass the season and to spend, in a round of pleasure, at least a portion of the net proceeds of the account sales. In the transport of these products nearly two thousand sailing ships and steamers were engaged, and in the town itself or its suburb of Algiers, on the opposite bank, were to be found all the appliances and facilities necessary for the conduct of so extensive a commerce. These, especially the work-shops and factories, and the innumerable river and bayou steamers that thronged the levee, were destined to prove of the greatest military value,