This line of testimony concluded, the prosecution next indicated its intention of introducing evidence to show Burr's connection with the assemblage on the island, when the defense sprang the coup it had been maturing from the outset. Pointing out the notorious fact that on the night of the 10th of December Burr had not been present at the island but had been two hundred miles away in Kentucky, they contended that, under the Constitution, the assemblage on Blennerhassett's island could not be regarded as his act, even granting that he had advised it, for, said they, advising war is one thing but levying it is quite another. If this interpretation was correct, then no overt act of levying war, either within the jurisdiction of the Court or stated in the indictment, had been, or could be, shown against Burr. Hence the taking of evidence--if not the cause itself, indeed--should be discontinued. The legal question raised by this argument was the comparatively simple one whether the constitutional provision regarding treason was to be interpreted in the light of the Common Law doctrine that "in treason all are principals." For if it were to be so interpreted and if Burr's connection with the general conspiracy culminating in the assemblage was demonstrable by any sort of legal evidence, then the assemblage was his act, his overt act, proved moreover by thrice the two witnesses constitutionally required! Again it fell to Wirt to represent the prosecution, and he discharged his task most brilliantly. He showed beyond peradventure that the Common Law doctrine was grounded upon unshakable authority; that, considering the fact that the entire phraseology of the constitutional clause regarding treason comes from an English statute of Edward III's time, it was reasonable, if not indispensable, to construe it in the light of the Common Law; and that, certainly as to a procurer of treason, such as Burr was charged with being, the Common Law doctrine was the only just doctrine, being merely a reaffirmation of the even more ancient principle that "what one does through another, he does himself." In elaboration of this last point Wirt launched forth upon that famous passage in which he contrasted Burr and the pathetic victim of his conspiracy: