delivered the opinion of the Court.
The question before us is the propriety of an order of the District Court for the Canal Zone vacating a foreign attachment of a vessel made in a libel
in personam.
We granted certiorari because important questions relating to the scope of admiralty jurisdiction and its exercise are in issue.
On March 7, 1948, the libel was filed against Compania Transmaritima Colombiana, S. A., a Colombian corporation, by Swift & Company Packers, a Nevada corporation, certain Cuban corporations and individuals, and a Colombian citizen. They brought the libel as owners of rice shipped from Ecuador to Cuba. It was alleged that the cargo had been delivered in good order to the M/V Cali, owned and operated by Transmaritima, and that the vessel had sunk, or partially sunk, off the island of Grand Cayman with resulting nondelivery of the cargo. This was supplemented by allegations of negligence. Process was prayed with the further request that if the respondent could not be found its goods and chattels *686 be attached, particularly a vessel known as the Alacran, or Caribe. This vessel was thereupon attached by the marshal.
On March 8, libellants filed a supplemental and amended libel, and on the basis of the following allegations joined the Compania Colombiana Del Caribe, S. A., as respondent. On or shortly prior to March 4, the Compania Del Caribe had been organized under the laws of Colombia and the Alacran had been transferred by Transmaritima to Del Caribe in fraud of the rights of libellants. The latter company had been organized by directors, officers and stockholders of Transmaritima, but no funds had been paid into its treasury for the issue of its stock, and the transfer of the Alacran was without real consideration. Del Caribe was “merely the creature or alter ego” of Transmaritima and “they should be held to be, as they are, one and the same.” Del Caribe, on or about March 4, had had the vessel’s name changed from Alacran to Caribe, and a new register had been issued accordingly. In the alternative, the claim was that Del Caribe was indebted to Transmaritima for at least a substantial part if not all of the purchase price of the Caribe.
Attachment of the vessel was again prayed on what appears to have been either of two grounds: since Transmaritima and Del Caribe were really one and the same, it mattered not which was deemed to be the owner of the Caribe; since the transfer of the Caribe to Del Caribe was a fraudulent transfer to be set aside, the vessel was in reality Transmaritima’s property and Del Caribe should be garnished. On the basis of the amended libel another attachment of the Caribe was made. 1
*687 With the supplemental libel, libellants submitted a list of interrogatories to be propounded to Del Caribe, calculated to disclose the true status of that company and of the transfer to it of the Caribe. On March 15, respondents gave notice that they would move for an order dismissing the libel and vacating the attachment. An accompanying affidavit relied primarily on the doctrine of jorum non conveniens. The District Court overruled this motion on March 31. The parties then entered into stipulations whereby the respondents’ time to answer the libel and interrogatories was extended to June 17. On June 11, they answered, putting in issue various questions relating to the liability arising out of the sinking of the Cali and to the transfer of the Caribe. At the same time Del Caribe objected to the interrogatories on various grounds. No disposition of these objections appears from the record.
On August 16, Del Caribe gave notice of a motion to dismiss the libel as to it and vacate the attachment. Various grounds were urged calling into question the jurisdiction of the court, the propriety of its exercise, and the adequacy of the allegations to state a claim in the libel. An accompanying affidavit set forth matters relating to the transfer.
On September 20, the District Court found that the nondelivery of the cargo was due to the beaching of the
Cali
in January, 1948; that Del Caribe had been organized in the latter part of February, 1948; and that Transmaritima had sold and transferred the
Caribe
to Del Caribe on February 25.
2
From these facts the district judge concluded that there was no jurisdiction in admiralty to inquire into the relations between the two
*688
respondent companies or the sale of the
Caribe.
In any event, the court declined to exercise jurisdiction to look into the transfer since it had taken place between two foreign corporations and in a foreign country. Accordingly, the attachment was ordered to be vacated. While libellants submitted additional evidence upon a rehearing, the court adhered to its original views.
The Court of Appeals affirmed. It held that jurisdiction to set aside a fraudulent transfer before judgment on the main claim was at best “doubtful,” that there was discretion to decline jurisdiction on principles of
forum non conveniens,
and that, in any event, libellants had not sustained their burden of producing proof that the transfer was fraudulent.
3
This we believe to be a fair résumé of an uncommonly confused and opaque record. It is especially hampering that the record is not clearer than it is when legal issues of real complexity are in controversy.
I. There is a threshold question as to the jurisdiction of the court below to entertain the appeal. It is claimed that the order vacating the attachment was not a final order and therefore not reviewable.
We believe that the order comes squarely within the considerations of our recent decision in
Cohen
v.
Beneficial Industrial Loan Corp.,
II. On finding that the Caribe had been sold by Transmaritima to Del Caribe prior to the filing of the libel, the District Court deemed itself without jurisdiction to determine whether the transfer was fraudulent. In consequence it felt compelled to treat Del Caribe as the owner of the vessel, and since only the property of Transmaritima could be validly attached the attachment had to be vacated. 4
The reasoning of the District Court was based on the view that a claim of fraud in the transfer of a vessel *690 was a matter for determination by a court of equity and therefore outside the bounds of admiralty jurisdiction. There is a good deal of loose talk to this effect in the reports, concurrent with talk that courts of admiralty exercise their jurisdiction upon equitable principles. Even as to admiralty jurisdiction we must be wary of verbal generalizations unrelated to their applications. Not the least creative achievement of judicial law-making is the body of doctrines that has been derived from the brief words of the Constitution extending the judicial power “to all Cases of admiralty and maritime Jurisdiction.” TJ. S. Const. Art. Ill, § 2. But it would be beyond human achievement even of a long line of judges especially equipped for dealing with admiralty matters to have produced a wholly harmonious body of admiralty law, or to have written opinions that should not have lent themselves through largeness or looseness of statement beyond the scope of their adjudications.
Unquestionably a court of admiralty will not enforce an independent equitable claim merely because it pertains to maritime property.
E. g., The Eclipse,
A few illustrative cases will take us out of the fog of generalities, for the decisions dealing with concrete situations afford a working approach even if not a rigid rule.
Nonmaritime contracts may be examined to determine whether they constitute a valid defense, although the same contracts will not support a libel or cross-libel for affirmative relief.
Armour & Co.
v.
Fort Morgan S. S. Co.,
In each of these cases a holding that admiralty must stay its hands as to a matter intrinsically nonmaritime but “necessary to the complete adjustment of rights over which admiralty has independent jurisdiction” would have seriously impaired the discharge by admiralty of the task which belongs to it. To recognize these subsidiary powers of admiralty to deal justly with the claims that are within its jurisdiction is not to enlarge the admiralty jurisdiction but to avoid its mutilating restriction. To generalize beyond this is to invite misleading or empty abstractions.
We can now see the immediate problem in its proper perspective. The process of foreign attachment is known of old in admiralty. It has two purposes: to secure a respondent’s appearance and to assure satisfaction in case the suit is successful.
Manro
v.
Almeida,
In
Lee
v.
Thompson,
We must conclude that the District Court was not without power to look into the transfer of the
Caribe
under the circumstances of this suit. But because power exists, its use is not inexorable. Cf.
Massachusetts
v.
Missouri,
III. It is urged that, even if there existed power to ascertain whether the transfer was fraudulent, vacation of the attachment was justified by libellants’ failure to establish a
prima jade
case of fraud. No doubt, the ultimate burden of establishing a fraudulent transfer was upon libellants. See
Cushing
v.
Laird,
Rule 23 was in substance invoked by respondents, as the Court of Appeals held, but the record does not support the view that its invocation put libellants to their proof that the transfer was fraudulent. They had no reason to believe that such proof was needed before trial. Neither of the two motions of respondents to vacate the attachment rested on an absence of fraud as a matter of fact. Respondents presented evidence through affidavits that a new corporation had been formed and a transfer of title to the vessel effected, but this was only to support their charges that the court lacked jurisdiction, that in any event it should decline jurisdiction under principles of forum non conveniens, and that the allegations in the libel did not state a cause of action. Nor were libellants put on notice by the District Court’s first opinion to put in proof on rehearing. Its holding was based on lack of jurisdiction to inquire into the transfer or, alternatively, on discretion to decline its exercise. Quite clearly it did not determine the issue of fraud in the transfer. The opinion denying rehearing did not break new ground. On these facts, the attachment could not be vacated for. a failure of libellants to support their charge of a fraudulent transfer. 8
*697
IV. There remains the question whether the District Court’s order may be justified as an exercise of discretion to decline jurisdiction under the doctrine of
jorum non conveniens.
The doctrine is of long standing in admiralty, but this Court has not previously had to apply it to a suit brought by a United States citizen. Such application has been rare even in the lower federal courts. Cf.
Canada Malting Co.
v.
Paterson Steamships, Ltd.,
The case must be reversed and remanded for proceedings not inconsistent with this opinion.
Reversed and remanded.
Notes
The marshal’s return failed to state that respondents could not be found within the jurisdiction. Cf.
International Grain Ceiling Co.
v.
Dill,
The district judge also found that the stockholders and managing officers of the two respondents were not identical, but these facts were irrelevant to his disposition of the case and are to the disposition made here.
The District Court did not dismiss the garnishment proceeding against Del Caribe, since that company was allegedly indebted to Transmaritima and some of the property of the Cali had been attached aboard the Caribe. The Court of Appeals suggested that the issue of fraud in the transfer of the Caribe could be adjudicated as part of the garnishment proceeding.
Libellants also sought to hold Del Caribe personally liable for the destruction of the
Cali’s
cargo of rice on the ground that it was merely the alter ego of Transmaritima. Success on this theory would render the issue of fraudulent transfer irrelevant, for then the assets of either company could be attached. The jurisdiction of a court of admiralty to determine the question of alter ego is undoubted.
The Willem Van Driel, Sr.,
It is important to note, however, that the relationship between the two respondent companies has an obvious relevance to the issue of fraudulent transfer.
The relevant portion of General Admiralty Rule 2 is as follows:
“In suits in personam the mesne process shall be by a simple monition in the nature of a summons to appear and answer to the suit, or by a simple warrant of arrest of the person of the respondent in the nature of a capias, as the libellant may, in his libel or information pray for or elect; in either case with a clause therein to attach his goods and chattels, or credits and effects in the hands of the garnishees named in the libel to the amount sued for, if said respondent shall not be found within the District.”
The Court of Appeals apparently regarded this distinction as important, for it held that the issues relating to the vessel Caribe might be adjudicated in the garnishment proceeding but not in connection with the attachment.
The relevant portion of Rule 23 is as follows:
“In case of the attachment of property . . . the party arrested or any person having a right to intervene in respect of the thing attached, may, upon evidence showing any improper practice or a manifest want of equity on the part of the libellant, have an order from the judge requiring the libellant to show cause instan ter why the arrest or attachment should not be vacated.” See 5 Benedict on Admiralty (Whitman ed. 1949) 234.
The eight months intervening between the filing of the libel and the opinion on rehearing were spent largely on respondents’ motions and to afford respondents opportunity to file answers. It is also pertinent that libellants’ interrogatories to Del Caribe were never answered and the exceptions taken to them never passed on by the District Court. The evidence contained in respondents’ affidavits was inadequate to support any determination of the fraud issue. Of course, if the court had required libellants to present such proof *697 as they had, it would have been for them to move that the exceptions to the interrogatories be overruled. But, as indicated, the importance of such a move was never made clear.
Compare
Koster
v.
Lumbermens Mutual Casualty Co.,
