The nature of the offense charged against these prisoners placed them under the domain of martial law, as they were shown by their own acts and declarations to be secret, active enemies of the government, the purpose of their crime being to give aid to the existing rebellion. For this reason the government left them in the hands of the military to be dealt with according to the laws of war; and the President, being _ex-officio_ Commander-in-Chief of the army and navy, ordered the Assistant Adjutant General of the army to detail a military commission, and send the accuse before it for a speedy trial. CHAPTER VIII. A MILITARY COMMISSION--ITS NATURE, CONSTITUTION, DUTIES, AND JURISDICTION. A military commission, as we have seen, is a judicial tribunal authorized by and constituted under the laws of war during a state of war. It consists of a definite number of commissioned officers designated by the order of detail. Its jurisdiction is limited, and its duties are also prescribed by that order. It is a military court detailed to try offenders against the laws of war, and clothed with power to decide both on the law and evidence in the case, and to prescribe the punishment due to the offense. It is constituted to act under a presiding officer, who is also designated in the order of detail. It has the assistance of a judge advocate with whom it consults in regard to any questions of law or of evidence that may arise. The office of a judge advocate does not exactly correspond with that of a states attorney in a civil court, for at the same time that it is his duty to see that the case of the government and the evidence are fairly presented, it is as much his duty to see that the accused shall have a fair and impartial trial. The party on trial has the right to have counsel of his own choice, and the government must secure the attendance of such witnesses in his defense as he may designate. The rules of law and of evidence are very nearly the same as those which prevail in the civil courts. A military commission combines, to a great extent, the functions of both court and jury, as it has to decide on questions of law and evidence as a court, and on the guilt or innocence of the accused, in the light of law and evidence, as a jury. Again, in rendering a sentence, in case of conviction, it exercises the functions of a court. The oath taken by the members of the detail, and which constitutes it a court, requires them to diligently try the case and judge and decide impartially, according to the law and evidence. Thus it will be seen that the rights of the accused are carefully guarded, and every precaution taken to make it certain that justice shall be done. This is the purpose as much in the constitution of a military as of a civil court. The only object of its constitution is to protect the innocent and condemn and punish the guilty, and thus secure the ends of justice and mercy. It is a benign provision of military law, and