It appears that this case came on for trial before the Circuit Court and a jury, upon an issue, in substance, whether the plaintiff, together with his wife and children, were the slaves of the defendant.

The court instructed the jury that, "upon the facts in this case, the law is with the defendant." This withdrew from the jury the consideration and decision of every matter of fact. The evidence in the case consisted of written admissions, signed by the counsel of the parties. If the case had been submitted to the judgment of the court, upon an agreed statement of facts, entered of record, in place of a special verdict, it would have been necessary for the court below, and for this court, to pronounce its judgment solely on those facts, thus agreed, without inferring any other facts therefrom. By the rules of the common law applicable to such a case, and by force of the seventh article of the amendments of the Constitution, this court is precluded from finding any fact not agreed to by the parties on the record. No submission to the court on a statement of facts was made. It was a trial by jury, in which certain admissions, made by the parties, were the evidence. The jury were not only competent, but were bound to draw from that evidence every inference which, in their judgment, exercised according to the rules of law, it would warrant. The Circuit Court took from the jury the power to draw any inferences from the admissions made by the parties, and decided the case for the defendant. This course can be justified here, if at all, only by its appearing that upon the facts agreed, and all such inferences of fact favorable to the plaintiff's case, as the jury might have been warranted in drawing from those admissions, the law was with the defendant. Otherwise, the plaintiff would be deprived of the benefit of his trial by jury, by whom, for aught we can know, those inferences favorable to his case would have been drawn.

The material facts agreed, bearing on this part of the case, are, that Dr. Emerson, the plaintiff's master, resided about two years at the military post of Fort Snelling, being a surgeon in the army of the United States, his domicil of origin being unknown; and what, if anything, he had done, to preserve or change his domicil prior to his residence at Rock Island, being also unknown.

Now, it is true, that under some circumstances the residence of a military officer at a particular place, in the discharge of his official duties, does not amount to the acquisition of a technical domicil. But it cannot be affirmed, with correctness, that it never does. There being actual residence, and this being presumptive evidence of domicil, all the circumstances of the case must be considered, before a legal conclusion can be reached, that his place of residence is not his domicil. If a military officer stationed at a particular post should entertain an expectation that his residence there would be indefinitely protracted, and in consequence should remove his family to the place where his duties were to be discharged, form a permanent domestic establishment there, exercise there the civil rights and discharge the civil duties of an inhabitant, while he did no act and manifested no intent to have a domicil elsewhere, I think no one would say that the mere fact that he was himself liable to be called away by the orders of the Government would prevent his acquisition of a technical domicil at the place of the residence of himself and his family. In other words, I do not think a military officer incapable of acquiring a domicil. (Bruce v. Bruce, 2 Bos. and Pul., 230; Munroe v. Douglass, 5 Mad. Ch. R., 232.) This being so, this case stands thus: there was evidence before the jury that Emerson resided about two years at Fort Snelling, in the Territory of Wisconsin. This may or may not have been with such intent as to make it his technical domicil. The presumption is that it was. It is so laid down by this court, in Ennis v. Smith, (14 How.,) and the authorities in support of the position are there referred to. His intent was a question of fact for the jury. (Fitchburg v. Winchendon, 4 Cush., 190.)

The case was taken from the jury. If they had power to find that the presumption of the necessary intent had not been rebutted, we cannot say, on this record, that Emerson had not his technical domicil at Fort Snelling. But, for reasons which I shall now proceed to give, I do not deem it necessary in this case to determine the question of the technical domicil of Dr. Emerson.

It must be admitted that the inquiry whether the law of a particular country has rightfully fixed the status of a person, so that in accordance with the principles of international law that status should be recognised in other jurisdictions, ordinarily depends on the question whether the person was domiciled in the country whose laws are asserted to have fixed his status. But, in the United States, questions of this kind may arise, where an attempt to decide solely with reference to technical domicil, tested by the rules which are applicable to changes of places of abode from one country to another, would not be consistent with sound principles. And, in my judgment, this is one of those cases.

The residence of the plaintiff, who was taken by his master, Dr. Emerson, as a slave, from Missouri to the State of Illinois, and thence to the Territory of Wisconsin, must be deemed to have been for the time being, and until he asserted his own separate intention, the same as the residence of his master; and the inquiry, whether the personal statutes of the Territory were rightfully extended over the plaintiff, and ought, in accordance with the rules of international law, to be allowed to fix his status, must depend upon the circumstances under which Dr. Emerson went into that Territory, and remained there; and upon the further question, whether anything was there rightfully done by the plaintiff to cause those personal statutes to operate on him.

Dr. Emerson was an officer in the army of the United States. He went into the Territory to discharge his duty to the United States. The place was out of the jurisdiction of any particular State, and within the exclusive jurisdiction of the United States. It does not appear where the domicil of origin of Dr. Emerson was, nor whether or not he had lost it, and gained another domicil, nor of what particular State, if any, he was a citizen.

On what ground can it be denied that all valid laws of the United States, constitutionally enacted by Congress for the government of the Territory, rightfully extended over an officer of the United States and his servant who went into the Territory to remain there for an indefinite length of time, to take part in its civil or military affairs? They were not foreigners, coming from abroad. Dr. Emerson was a citizen of the country which had exclusive jurisdiction over the Territory; and not only a citizen, but he went there in a public capacity, in the service of the same sovereignty which made the laws. Whatever those laws might be, whether of the kind denominated personal statutes, or not, so far as they were intended by the legislative will, constitutionally expressed, to operate on him and his servant, and on the relations between them, they had a rightful operation, and no other State or country can refuse to allow that those laws might rightfully operate on the plaintiff and his servant, because such a refusal would be a denial that the United States could, by laws constitutionally enacted, govern their own servants, residing on their own Territory, over which the United States had the exclusive control, and in respect to which they are an independent sovereign power. Whether the laws now in question were constitutionally enacted, I repeat once more, is a separate question. But, assuming that they were, and that they operated directly on the status of the plaintiff, I consider that no other State or country could question the rightful power of the United States so to legislate, or, consistently with the settled rules of international law, could refuse to recognise the effects of such legislation upon the status of their officers and servants, as valid everywhere.

This alone would, in my apprehension, be sufficient to decide this question.