The orders of the expedition were, that unarmed boats should first be sent to the fort with stores only; but if these were fired upon, every effort was to be made to relieve the fort by stratagem or force. The vessels of war and the Baltic proved of too heavy draft for any hopes of passing the bar, and the steam-tugs which were to have been sent in with supplies, failed to make their appearance. The attack on the fort, before any measures of a peaceable character could be adopted for its relief, left no alternative but force, to the commandant of the fleet, if the object of his expedition was to be accomplished. A consultation of officers was held at four o’clock on the afternoon of the 12th, and the following plan was agreed upon: the Pawnee and the Harriet Lane were to remain at anchor during the night; at dawn, on the 13th, the Pawnee was to hoist out her armed launches, and the Baltic was to put her boats alongside, freighted with the provisions and troops designed for the fort. The war vessels were then to tow the boats as far as possible on their perilous journey, when they were to be cast off, and allowed to pursue their course toward the fort, relying upon the guns of the men-of-war, and what aid might be extended from Sumter, to protect them from the batteries and flotilla of armed boats, which were in readiness to dispute their advance. During the night the Baltic went aground on Rattlesnake Shoals, and the plan agreed upon was, from necessity, relinquished. The conflagration of the barracks of the fort having precipitated its evacuation earlier than was anticipated, the officers of the fleet abandoned other plans for its relief. At two o’clock on the 14th of April, Major Anderson and the garrison of Fort Sumter were received on board the Baltic, and the fleet shortly after sailed for New York. The flag of the fort was borne at the mast-head of the Baltic as she entered the bay of New York, where it was saluted by guns from every fort in the harbor, and hailed by the shouts of more than a hundred thousand people, who lined the wharves of the city. It was also raised over the equestrian statue of Washington in Union Square, in that city, when the great Union meeting was held on the afternoon of Saturday, April 20. THE NATION’S RESPONSE. The first gun that boomed against Fort Sumter struck the great American Union with a shock that vibrated from the centre to its outer verge. Every heart, true or false to the great Union, leaped to the sound, either in patriotism or treason, on that momentous day.