We were in the deepest despair, until just at this time Colonel Scott informed me that there was a plan already devised which, if executed with secrecy, would open the Tennessee and save the national cause. I went immediately to Mr. Lincoln and talked the whole matter over. He said he did not himself doubt that the plan was feasible, but said there was one difficulty in the way; that no military or naval man had any idea of such a movement, it being the work of a civilian, and none of them would believe it safe to make such an advance upon only a navigable river, with no protection but a gunboat fleet, and they would not want to take the risk. He said it was devised by Miss Carroll, and military men were extremely jealous of all outside interference. I pleaded earnestly with him, for I found there were influences in his Cabinet then averse to his taking the responsibility, and wanting everything done in deference to the views of McClellan and Halleck. I said to Mr. Lincoln: "You know we are now in the last extremity, and you have to choose between adopting and at once executing a plan which you believe to be the right one and save the country, or defer to the opinions of military men in command and lose the country." He finally decided he would take the initiative; but there was Mr. Bates, who had suggested the gunboat fleet, and wanted to advance down the Mississippi, as originally designed; but after a little he came to see that no result could be achieved on that mode of attack, and he united with us in favor of the change of expedition as you recommended.