Our spy was not long in returning from St. Catherine's with a dispatch which was also allowed to pass unopened, upon his assurance that it contained nothing of importance. In this way he went back and forward from Richmond to St. Catherine's once or twice. We supplied him with money to a limited extent, and also with one or two more horses. He said that he got some money from the Confederates, but had not thought it prudent to accept from them anything more than very small sums, since his professed zeal for the Confederate cause forbade his receiving anything for his traveling expenses beyond what was absolutely necessary.
During the summer of 1864 the activity of Grant's campaign, and the fighting which prevailed all along the line, somewhat impeded our young man's expeditions, but did not stop them. All his subsequent dispatches, however, whether coming from Richmond or from Canada, were regularly brought to the War Department, and were opened, and in every case a copy of them was kept. As it was necessary to break the seals and destroy the envelopes in opening them, there was some difficulty in sending them forward in what should appear to be the original wrappers. Coming from Canada, the paper employed was English, and there was a good deal of trouble in procuring paper of the same appearance. I remember also that one important dispatch, which was sealed with Mr. Clay's seal, had to be delayed somewhat while we had an imitation seal engraved. But these delays were easily accounted for at Richmond by the pretense that they had been caused by accidents upon the road and by the necessity of avoiding the Federal pickets. At any rate, the confidence of the Confederates in our agent and in theirs never seemed to be shaken by any of these occurrences.
Finally our dispatch bearer reported one day at the War Department with a document which, he said, was of extraordinary consequence. It was found to contain an account of a scheme for setting fire to New York and Chicago by means of clock-work machines that were to be placed in several of the large hotels and places of amusement—particularly in Barnum's Museum in New York—and to be set off simultaneously, so that the fire department in each place would be unable to attend to the great number of calls that would be made upon it on account of these Confederate conflagrations in so many different quarters, and thus these cities might be greatly damaged, or even destroyed.
This dispatch was duly sealed up again and was taken to Richmond, and a confidential officer was at once sent to New York to warn General Dix, who was in command there, of the Confederate project. The general was very unwilling to believe that any such design could be seriously entertained, and Mr. John A. Kennedy, then superintendent of police, was equally incredulous. But the Secretary of War was peremptory in his orders, and when the day of the incendiary attempt arrived both the military and the police made every preparation to prevent the threatened catastrophe. The officer who went from Washington was lodged in the St. Nicholas Hotel, one of the large establishments that were to be set on fire, and while he was washing his hands in the evening, preparatory to going to dinner, a fire began burning in the room next to his. It was promptly put out, and was found to be caused by a clock-work apparatus which had been left in that room by a lodger who had departed some hours before. Other fires likewise occurred. In every instance these fires were extinguished without much damage and without exciting any considerable public attention, thanks to the precautions that had been taken in consequence of the warning derived from Mr. Clay's dispatch to Mr. Benjamin in Richmond. The plan of setting fire to Chicago proved even more abortive; I do not remember that any report of actual burning was received from there.
Later in the fall, after the military operations had substantially terminated for the season, a dispatch was brought from Canada, signed by Mr. Clay, and addressed to Mr. Benjamin, as Secretary of State in the Confederate Government, conveying the information that a new and really formidable military expedition against northern Vermont—particularly against Burlington, if I am not mistaken—had been organized and fitted out in Canada, and would make its attack as soon as practicable. This was after the well-known attempt upon St. Albans and Lake Champlain, on October 19, 1864, and promised to be much more injurious. The dispatch reached Washington one Sunday morning, and was brought to the War Department as usual, but its importance in the eyes of the Confederate agents had led to its being prepared for transportation with uncommon care. It was placed between two thicknesses of the pair of re-enforced cavalry trousers which the messenger wore, and sewed up so that when he was mounted it was held between his thigh and the saddle.
Having been carefully ripped out and opened, it was immediately carried to Mr. Stanton, who was confined to his house by a cold. He read it. "This is serious," he said. "Go over to the White House and ask the President to come here." Mr. Lincoln was found dressing to go to church, and he was soon driven to Mr. Stanton's house. After discussing the subject in every aspect, and considering thoroughly the probability that to keep the dispatch would put an end to communications by this channel, they determined that it must be kept. The conclusive reason for this step was that it established beyond question the fact that the Confederates, while sheltering themselves behind the British Government in Canada, had organized and fitted out a military expedition against the United States. But while the dispatch afforded evidence that could not be gainsaid, the mere possession of it was not sufficient. It must be found in the possession of the Confederate dispatch bearer, and the circumstances attending its capture must be established in such a manner that the British Foreign Office would not be able to dispute the genuineness of the document. "We must have this paper for Seward," said Mr. Lincoln. "As for the young man, get him out of the scrape if you can."
Accordingly, the paper was taken back to the War Department and sewed up again in the trousers whence it had been taken three hours before. The bearer was instructed to start at dusk on the road which he usually took in passing through the lines, to be at a certain tavern outside of Alexandria at nine o'clock in the evening, and to stop there to water his horse. Then information was sent through Major-General Augur, commandant of Washington and the surrounding region, to Colonel Henry H. Wells, then provost marshal general of the defenses south of the Potomac, stationed at Alexandria, directing him to be at this tavern at nine o'clock in the evening, and to arrest a Confederate dispatch bearer, concerning whom authentic information had been received at the War Department, and whose description was furnished for his (Wells's) guidance. He was to do the messenger no injury, but to make sure of his person and of all papers that he might have upon him, and to bring him under a sufficient guard directly to the War Department. And General Augur was directed to be present there, in order to assist in the examination of the prisoner, and to verify any dispatches that might be found.
Just before midnight a carriage drove up to the door of the War Department with a soldier on the box and two soldiers on the front seat within, while the back seat was occupied by Colonel Wells and the prisoner. Of course, no one but the two or three who had been in the secret was aware that this gentleman had walked quietly out of the War Department only a few hours previously, and that the paper which was the cause of the entire ceremony had been sewed up in his clothes just before his departure. Colonel Wells reported that, while the prisoner had offered no resistance, he was very violent and outrageous in his language, and that he boasted fiercely of his devotion to the Confederacy and his detestation of the Union. During the examination which now followed he said nothing except to answer a few questions, but his bearing—patient, scornful, undaunted—was that of an incomparable actor. If Mr. Clay and Mr. Benjamin had been present, they would have been more than ever certain that he was one of their noblest young men. His hat, boots, and other articles of his clothing were taken off one by one. The hat and boots were first searched, and finally the dispatch was found in his trousers and taken out. Its nature and the method of its capture were stated in a memorandum which was drawn up on the spot and signed by General Augur and Colonel Wells and one or two other officers who were there for the purpose, and then the dispatch bearer himself was sent off to the Old Capitol Prison.