From the captured contrabands Porter learned that the attempt to cut off his retreat was directed by the military authorities at Vicksburg. This was a startling revelation. He had thought that the Confederates were in entire ignorance of his movement; and now it turned out that the wily Pemberton had kept a sharp lookout on the marauding gunboats, and was shrewdly planning for their capture. While Porter was pondering over this new discovery, a party of scouts came in, bringing in four captured Confederates, two of whom were commissioned officers. The commanding officer, a mere boy, was somewhat chagrined at being captured, but felt confident that his friends would recapture him shortly. Porter politely asked him to take a glass of wine and some supper. "I don't care if I do," responded the youngster; "and I have the less compunction in taking it, as it belongs to us anyhow. In two hours you will be surrounded and bagged. You can't escape. How in the Devil's name you ever got here, is a wonder to me." Porter smiled pleasantly, and, helping his guests lavishly, proceeded to question them on the numbers and position of the Confederate troops. He learned that a large body of troops had been sent out to surround the iron-clads, and were even then closing in upon the intruders. The danger was imminent, but Porter showed no trepidation. "How far off are your troops?" he asked. "About four miles. They will bag you at daylight," was the confident response. "Well, gentlemen," said the admiral, "Gen. Sherman is now surrounding your forces with ten thousand men, and will capture them all before daylight." And so saying the admiral went on deck, leaving his captives lost in wonder; for the information carried to the Vicksburg authorities had made no mention of troops.