On Friday, the twelfth, the first witness was sworn, and his name was Richard Montgomery. His testimony, as well as that of the other witnesses sworn that day, was taken in secret session, and no portion of it was allowed to reach the public until long after the trial. It was all directed to establish the complicity of the rebel agents in Canada and through them the complicity of Jefferson Davis and other officers of the "Confederacy" in the assassination. In other words, this testimony was given to prove the guilt, not of the men much less of the woman on trial, but of the men included in the charge but not on trial; and whom, as it now appears, the United States never intended to try. To connect the defunct Confederacy in the person of its captive Chief with the murder of the President would throw a halo of romantic wickedness about the crime, and chime in with the prevalent hatred towards every human being in any way connected with the Rebellion. This class of testimony continued to be introduced every now and then during the trial--whenever most convenient to the prosecution--and as often as it was given the court-room was cleared of spectators and the session secret; the isolated counsel for Mrs. Surratt, utterly at a loss to imagine the connection of such testimony, given under such solemn precautions, with their own client, and knowing nothing whatever of the witnesses themselves, must have looked on in bewildered amazement, and had no motive for cross-examination. The chief witnesses who gave this carefully suppressed evidence were spies upon the rebel agents in Canada paid by the United States, and, at the same time, spies upon the United States paid by the rebel agents. They were, of course, ready to swear to as many conversations with these agents, both before and after the assassination, in which those agents implicated themselves and the heads of government at Richmond in the most reckless manner, as the Judge-Advocates thought necessary or advisable. The head, parent and tutor of this band of witnesses was a man called Sanford Conover. After giving his testimony before the Commission, he went to Canada and again resumed his simulated intimacy with the Confederates there, passing under the name of James W. Wallace. An unauthorized version of his testimony having leaked out and appearing in the newspapers, he was called to account for it by his Canadian friends. He then made and published an affidavit that the person who had given testimony before the Commission was not himself but an imposter, and at the same time also published an offer of $500 reward for the arrest of "the infamous and perjured scoundrel who secretly personated me under name of Sanford Conover, and deposed to a tissue of falsehood before the military Commission at Washington."