For several days they patrolled the river near the suspected point, but nothing unusual was seen; neither could any intelligence of the contemplated move be obtained from the people on shore. There were several houses on the beat, and in one of them lived a Frenchman, who, as he said, having claimed the protection of his own country, was not compelled to bear arms; neither was he at all interested in the war. It was near his house, however, that the crossing of the cavalry was to take place, and the captain of the Trenton thought that this neutral Frenchman would bear watching.

Although there were several white women on the premises, he was the only man who had been seen; and he seemed to be in constant anxiety lest the rebels should confiscate a large drove of cattle he had at a pasture back in the country, and was in the habit of riding out twice each week to "see to them," as he said. There was something suspicious in this, for persons as much in want of provisions as the rebels were reported to be—as they had gathered up all the stock in the country for miles around Vicksburg—would not be likely to respect such property, although it did belong to a neutral.

The captain and his officers mingled freely with the people, who appeared to be eager to communicate all the plans of the rebels with which they had become acquainted. Frank, as usual, was on the watch; and if he sometimes paid a visit to the house, he was more frequently seen questioning the negroes—of whom there were about half a dozen on the plantation, the others having been compelled to leave their master to work on the fortifications—who were either profoundly ignorant of what was going on, or else were true rebels. There was one negro, in particular, in whom the young officer was interested. He was a tall, muscular fellow, black as midnight, about whom there was a kind of sneaking, hangdog look that Frank did not like. He always accompanied his master on his trips to attend his cattle, and Frank felt confident that if any one about the plantation knew of any thing suspicious going on, it was this negro; but, in spite of his efforts, he could not find an opportunity to talk with him, for the negro was generally in the company of his master, and, when alone, seemed to take particular pains to avoid the young officer. This was enough to arouse his suspicions, and he determined to watch him closely. He reported the matter to the captain, who readily granted his request that he might be allowed to spend his time, when off watch, on shore.

A week passed, but nothing had been developed. At length, one morning the Frenchman prepared to pay his usual visit to the country. The negro was to accompany him, and as Frank saw them about to move off, he inquired, carelessly:

"Haven't you got another horse? If you have, I should like to go with you."

"O, no," answered the man, quickly, "I have no other horse; and if I had, it wouldn't do for you to go, for you would certainly get captured."

This set Frank to thinking. The Frenchman had often told him that there were no rebels in that section of the country, and now his excuse for not wanting company was that Frank would be captured. There was something suspicious in this. After seeing the man depart, he hailed the ship for a boat, and as soon as he arrived on board, sought an interview with the captain.

"I do not believe, sir," said he, "that this Frenchman owns any stock in the country. It is my opinion that he goes out there to hold communication with the rebels. He's a sort of spy and messenger-boy, and relies on his nationality to protect him from suspicion."

Frank then related the particulars of what had transpired at the house, and the captain readily agreed with him. But the question was, how to proceed, in order to ascertain what was going on, and what kind of information was furnished the rebels. It was impossible to follow the men on their trips without being discovered; neither was it policy to seize the man, accuse him of treachery, and compel him to confess the truth, for the plot, whatever it was, might not be completed, and it might be necessary to keep the Frenchman in ignorance of the fact that his complicity with the rebels had become known, in order that, when the work was completed, it might be finished up entirely.

"Well, to tell the truth," said the captain, rising from his chair and pacing up and down the cabin, "I really don't know how to act. That something is wrong, I have long been satisfied; but I don't know how to go to work to find out what it is."