"Sec. 201. When a city or province is threatened, or actually attacked, it must not, for the sake of escaping a danger, separate itself, or abandon its natural Prince, even when the State or the Prince is unable to give it immediate and effectual assistance. Its duty, its political engagements, oblige it to make the greatest efforts in order to maintain itself in its present state. If it is overcome by force, necessity, that irresistible law, frees it from its former engagements, and gives it a right to treat with the conqueror, in order to obtain the best terms possible. If it must either submit to him or perish, who can doubt but it may, and even ought to prefer the former alternative? Modern usage is conformable to this decision,—a city submits to the enemy, when it cannot expect safety from vigorous resistance. It takes an oath of fidelity to him, and its sovereign lays the blame on fortune alone."
"Sec. 202. The State is obliged to protect and defend all its members; and the Prince owes the same assistance to his subjects. If, therefore, the State or the Prince refuses or neglects to succor a body of people who are exposed to imminent danger, the latter, being thus abandoned, become perfectly free to provide for their own safety and preservation in whatever manner they find most convenient, without paying the least regard to those who, by abandoning them, have been the first to fail in their duty. The Canton of Zug, being attacked by the Swiss in 1352, sent for succor to the Duke of Austria, its sovereign; but that Prince, being engaged in discourse concerning his hawks at the time when the deputies appeared before him, would scarcely condescend to hear them. Thus abandoned, the people of Zug entered into the Helvetic Confederacy. The city of Zurich had been in the same situation the year before. Being attacked by a band of rebellious citizens, who were supported by the neighboring nobility, and the House of Austria, it made application to the head of the Empire; but Charles IV., who was then Emperor, declared to its deputies that he could not defend it, upon which Zurich secured its safety by an alliance with the Swiss. The same reason has authorized the Swiss in general to separate themselves entirely from the Empire which never protected them in any emergency. They had not denied its authority for a long time before their independence was acknowledged by the Emperor, and the whole Germanic Body, at the treaty of Westphalia."
I also refer to the case of the United States v. Hayward, 2 Gallison, 485, which was a writ of error to the District Court of Massachusetts, in a case of alleged breach of the revenue laws. It appears that Castine (in Maine) was taken possession of by the British troops on the 1st of September, 1814, and was held in their possession until after the Treaty of Peace.
Judge Story says:
"The second objection is, that the Court directed the Jury that Castine was, under the circumstance, a foreign port. By 'foreign port,' as the terms are here used, may be understood a port within the dominions of a foreign sovereign, and without the dominions of the United States. The port of Castine is the port of entry for the District of Penobscot, and is within the acknowledged territory of the United States. But, at the time referred to in the bill of exceptions, it had been captured, and was in the open and exclusive possession of the enemy. By the conquest and occupation of Castine, that territory passed under the allegiance and sovereignty of the enemy. The sovereignty of the United States over the territory was, of course, suspended, and the laws of the United States could no longer be rightfully enforced, or be obligatory upon the inhabitants, who remained and submitted to the conquerors."
Now, gentlemen, I must trouble you, very briefly, with a reference to one or two other authorities on that subject. At page 188 of Foster's Crown Law that learned author says:
"Sec 8. Protection and allegiance are reciprocal obligations, and consequently the allegiance due to the Crown must, as I said before, be paid to him who is in the full and actual exercise of the regal powers, and to none other. I have no occasion to meddle with the distinction between Kings de facto and Kings de jure, because the warmest advocates for that distinction, and for the principles upon which it hath been founded, admit that even a King de facto, in the full and sole possession of the Crown, is a King within the Statute of Treasons; it is admitted, too, that the throne being full, any other person out of possession, but claiming title, is no King within the act, be his pretensions what they may.
"These principles, I think, no lawyer hath ever yet denied. They are founded in reason, equity, and good policy."
And again, at page 398, he continues:
"His Lordship [Hale] admitted that a temporary allegiance was due to Henry VI. as being King de facto. If this be true, as it undoubtedly is, with what color of law could those who paid him that allegiance before the accession of Edward IV. be considered as traitors? For call it a temporary allegiance, or by what other epithet of diminution you please, still it was due to him, while in full possession of the Crown, and consequently those who paid him that due allegiance could not, with any sort of propriety, be considered as traitors for doing so.