The binding legal principles established are: (1) To attach property to found or confirm jurisdiction over a peregrine under section 3(2) of the Admiralty Jurisdiction Regulation Act 105 of 1983, an applicant must show (a) a prima facie case against the respondent and (b) that the respondent is the owner of the property to be attached on a balance of probabilities. (2) In appropriate circumstances, particularly where an applicant's case and the respondent's denial are mutually destructive, the requirement to adduce independent evidence of a prima facie case may be relaxed, and the applicant may rely on the respondent's own allegations (such as those in a plea or answering affidavit) to establish the prima facie case. (3) Section 5(1) of the Admiralty Jurisdiction Regulation Act 105 of 1983, properly construed, permits the joinder of a defendant in the alternative, even where such joinder would subject a person to the court's jurisdiction who would not otherwise be amenable to it. (4) The word 'may' in section 5(1) is permissive and confers a discretion on the court to permit or refuse joinder. (5) The discretion should be exercised having regard to the objectives of the provision (to enable all parties to a maritime dispute to be joined in one action) and the absence of prejudice to the party sought to be joined.