Some question has been made as to the character of the residence in this case in the free State. But we regard the facts as set forth in the agreed case as decisive. The removal of Dr. Emerson from Missouri to the military posts was in the discharge of his duties as surgeon in the army, and under the orders of his Government. He was liable at any moment to be recalled, as he was in 1838, and ordered to another post. The same is also true as it respects Major Taliaferro. In such a case, the officer goes to his post for a temporary purpose, to remain there for an uncertain time, and not for the purpose of fixing his permanent abode. The question we think too plain to require argument. The case of the Attorney General _v._ Napier, (6 Welsh, Hurtst. and Gordon Exch. Rep., 217,) illustrates and applies the principle in the case of an officer of the English army. A question has been alluded to, on the argument, namely: the right of the master with his slave of transit into or through a free State, on business or commercial pursuits, or in the exercise of a Federal right, or the discharge of a Federal duty, being a citizen of the United States, which is not before us. This question depends upon different considerations and principles from the one in hand, and turns upon the rights and privileges secured to a common citizen of the republic under the Constitution of the United States. When that question arises, we shall be prepared to decide it. Our conclusion is, that the judgment of the court below should be affirmed. * * * * * Mr. Justice GRIER. I concur in the opinion delivered by Mr. Justice Nelson on the questions discussed by him. I also concur with the opinion of the court as delivered by the Chief Justice, that the act of Congress of 6th March, 1820, is unconstitutional and void; and that, assuming the facts as stated in the opinion, the plaintiff cannot sue as a citizen of Missouri in the courts of the United States. But, that the record shows a prima facie case of jurisdiction, requiring the court to decide all the questions properly arising in it; and as the decision of the pleas in bar shows that the plaintiff is a slave, and therefore not entitled to sue in a court of the United States, the form of the judgment is of little importance; for, whether the judgment be affirmed or dismissed for want of jurisdiction, it is justified by the decision of the court, and is the same in effect between the parties to the suit. * * * * * Mr. Justice DANIEL.