None of Brown's New England supporters approved of his invasion of Virginia, and Mr. Sanborn especially argued the matter with him and endeavored to dissuade him from it. He thus became acquainted, however, with Brown's plans, and was the only person outside of Brown's immediate followers who knew of the proposed attack on Harper's Ferry. When the attempt failed and John Brown was a prisoner in Charlestown jail, Mr. Sanborn found himself, as an accessory before the act, in a most trying situation. If carried to Virginia either as a witness or as "particeps criminis" his chance for life would be a slight one. The question was, would General Banks, who was then governor of Massachusetts, refuse to surrender him. John A. Andrew did not consider it safe to rely on him; and Mr. Sanborn accordingly disappeared for the winter, his school being carried on meanwhile by an assistant and some public spirited Concord ladies, one of whom was a sister of Hon. E. R. Hoar. In the spring Mr. Sanborn reappeared, and was almost immediately summoned by a United States marshal to give an account of himself before the senate committee in Washington. This he declined to do, believing that the townspeople would forcibly resist any attempts to carry him off. The marshal, however, set a trap for him that missed little of being successful. He came to Concord at midnight, and secreted himself in an old barn which was close to the school-house, and belonged to one Mr. Holbrook, a custom-house officer. There he remained all the next day, keeping watch of Mr. Sanborn's movements through the cracks in the boards. A little after nine in the evening he was joined by four assistants in a carriage. They then proceeded to Mr. Sanborn's house, seized him at the door, and in spite of his great size and strength, would certainly have carried him off had it not been for the courage and energy of his sister Sarah. She screamed "murder," and seizing the carriage-whip, made such good use of it that the horses were with difficulty prevented from running away. Her cries waked up the blacksmith in the next house, and he quickly came to the rescue. The "Bigelow girls" ran through the village like wild cats ringing door-bells and calling on the people. In less than twenty minutes nearly every man in town, Emerson included, was on the spot. The crowd showed a determined spirit, and the marshals were probably glad enough when Judge Hoar appeared with a writ of "habeas corpus," and took the prisoner out of their hands in a legal manner. The case was tried in Boston next day, and Mr. Sanborn was adjudged to have the right of it. A lively celebration followed in the Concord town hall that evening, and Miss Sarah Sanborn was presented with an elegant revolver; but the old borough had not been so stirred up since '75.